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Abbasi B, Ganjali R, Akhavan R, Tavassoli A, Khojasteh F. The accuracy of non-contrast brain CT scan in predicting the presence of a vascular etiology in patients with primary intracranial hemorrhage. Sci Rep 2023; 13:9447. [PMID: 37296161 PMCID: PMC10256691 DOI: 10.1038/s41598-023-36042-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 05/28/2023] [Indexed: 06/12/2023] Open
Abstract
Spontaneous intraparenchymal cerebral hemorrhages (SIPH) account for 10-15% of acute strokes. Sorting these patients according to the risk of harboring an underlying vascular etiology may help selecting the patients who would mostly benefit from Multidetector CT Angiography (MDCTA). The aim of this study was to evaluate the accuracy of Non-Contrast brain CT (NCCT) in predicting possible vascular etiologies in patients with SIPH. In this retrospective study, we evaluated the NCCT of 334 patients who presented with SIPH from March 2017 to March 2021 and we looked for vascular etiologies in the CTA which was performed for these patients. We used NCCT criteria to predict the presence of any vascular etiologies in SIPH patients and proposed a scoring system based on these criteria which might predict the risk of vascular ICH (VICH score). Out of 334 evaluated patients, 9.3% had an underlying vascular etiology. Independent predictors of the vascular etiology included: age < 46 years, no history of hypertension and coagulation disorders, lobar hemorrhages, and presence of significant perilesional edema. We used these criteria and NCCT classification to create a practical scoring system to predict the risk of vascular ICH (VICH). In our study, VICH score ≥ 4 had 51.6% sensitivity and 96.4% specificity for predicting a positive MDCTA as the maximum optimal cut-off point. The VICH score seemed to be successful in predicting vascular etiologies in this retrospective cohort of 334 patients. This scoring system can be used to select patients if there are limited resources to perform CT angiography.
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Affiliation(s)
- Bita Abbasi
- Department of Radiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Raheleh Ganjali
- Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Clinical Research Development Unit, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Reza Akhavan
- Department of Emergency Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ahmadreza Tavassoli
- Department of Radiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Fatemeh Khojasteh
- Department of Radiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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D'Argento F, Pedicelli A, Ciardi C, Leone E, Scarabello M, Infante A, Alexandre A, Lozupone E, Valente I, Colosimo C. Intra- and inter-observer variability in intracranial aneurysm segmentation: comparison between CT angiography (semi-automated segmentation software stroke VCAR) and digital subtraction angiography (3D rotational angiography). LA RADIOLOGIA MEDICA 2020; 126:484-493. [PMID: 32902826 DOI: 10.1007/s11547-020-01275-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 08/27/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE To compare size and morphologic features of three-dimensional aneurysm models, obtained with a semi-automated segmentation software (Stroke VCAR, GE, USA) from cerebral CT angiography (CTA) data, to three-dimensional aneurysm models obtained with digital subtraction angiography (DSA, with 3D rotational angiography acquisition-3DRA), considered as the reference standard. METHODS In this retrospective study, we reviewed 132 patients, with a total number of 137 intracranial aneurysm, who underwent CTA and subsequent DSA examination, supplemented with 3DRA. We compared neck length, short axis and long axis measured on 3DRA model to the same variables measured on 3D-CTA model by two blinded readers and to the automatic software dimensions. Therefore, statistics analysis assessed intra-observer and inter-observer variability and differences between patients with or without subarachnoid hemorrhage (SAH). RESULTS There were no significant differences in short-axis and long-axis measurements between 3D angiographic and 3D-CTA models, while comparison of neck lengths revealed a statistically significant difference, which tended to be greater for smaller neck lengths (partial volume effect and "kissing vessels" artifact). There were significant differences between manual and automatic data measured for the same three variables, and the presence of SAH did not affect aneurysm 3D reconstruction. Inter-observer agreement resulted moderate for neck length and substantial for short axis and long axis. CONCLUSION The examined 3D-CTA segmentation system is a reproducible procedure for aneurysm morphologic characterization and, in particular, for assessment of aneurysm sac dimensions, but considerable carefulness is required in neck length interpretation.
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Affiliation(s)
- F D'Argento
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.
| | - A Pedicelli
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - C Ciardi
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - E Leone
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - M Scarabello
- Postgraduate School in Radiodiagnostics, Università degli Studi di Milano, Milan, Italy
| | - A Infante
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - A Alexandre
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - E Lozupone
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - I Valente
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - C Colosimo
- UOC Radiologia e Neuroradiologia, Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.,Instituto di Radiologia, Università Cattolica del Sacro Cuore, Rome, Italy
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Comparison of Magnetic Resonance Angiography and Computed Tomography Angiography Stereoscopic Cerebral Vascular Models. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020. [PMID: 31894566 DOI: 10.1007/978-3-030-31904-5_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
In this paper, we will discuss and compare the stereoscopic models developed from two types of radiographic data, Magnetic Resonance Angiography (MRA) images and Computed Tomography Angiography (CTA) images. Stereoscopic models were created using surface or volume segmentation and semi-auto combined segmentation techniques. Although, the CTA data were found to improve the speed and quality of constructing virtual vascular models compared to conventional CT data, small blood vessels were difficult to capture during the imaging and reconstruction process thereby limiting the fidelity of the stereoscopic models. Thus, high contrast Magnetic Resonance Angiography (MRA) images offer better resolution to visualize and capture the smaller branches of the cerebral vasculature than CTA images.
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Four simultaneous anterior cerebral artery aneurysms (three initially unsuspected) with surgical treatment. Radiol Case Rep 2019; 14:1533-1538. [PMID: 31709022 PMCID: PMC6831845 DOI: 10.1016/j.radcr.2019.09.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 09/20/2019] [Accepted: 09/22/2019] [Indexed: 11/22/2022] Open
Abstract
Distal anterior cerebral artery aneurysms are rare, comprising approximately 6% of all intracranial aneurysms. These aneurysms tend to be smaller in size, broad-based, associated with additional aneurysms and at arterial branching sites, which can make both diagnosis and treatment difficult. Here we report a case of a 63-year-old female who presented with headache and perioral paresthesia determined to be Hunt & Hess scale grade 1. Computed tomography angiography discovered a medium-sized left A2 trunk saccular aneurysm. Intraoperatively 2 additional small blister type aneurysms not noted on initial computed tomography were discovered and treated via clipping and wrapping, respectively. Postoperatively a cerebral angiogram revealed an additional small right A2 trunk broad-based aneurysm. Preoperative evaluation of cerebral vasculature with a cerebral angiogram or high-resolution digital subtraction angiography is essential as multiple aneurysms are commonly associated with anterior cerebral artery aneurysms. The patient was successfully treated without any operative or postoperative complications and has remained symptom-free at 1 year follow up.
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Harvey EC, Feng M, Ji X, Zhang R, Li Y, Chen GH, Li K. Impacts of photon counting CT to maximum intensity projection (MIP) images of cerebral CT angiography: theoretical and experimental studies. Phys Med Biol 2019; 64:185015. [PMID: 31315093 DOI: 10.1088/1361-6560/ab32fe] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
While CTA is an established clinical gold standard for imaging large cerebral arteries and veins, an important challenge that currently remains for CTA is its limited performance in imaging small perforating arteries with diameters below 0.5 mm. The purpose of this work was to theoretically and experimentally study the potential benefits of using photon counting detector (PCD)-based CT (PCCT) to improve the performance of CTA in imaging these small arteries. In particular, the study focused on an important component of the CTA image package known as the maximum intensity projection (MIP) image. To help understand how the physical properties of a detector quantitatively influence the MIP image quality, a theoretical model on the statistical properties of MIP images was developed. After validating this model, it was used to explore the individual and joint contribution of the following detector properties to the MIP signal-to-noise ratio (SNR): inter-slice noise covariance, spatial resolution along the z direction, and native pixel pitch along z. The model demonstrated that superior slice sensitivity, reduced inter-slice noise correlation, and smaller native pixel pitch along z provided by PCDs lead to improved vessel SNR in MIP images. Finally, experiments were performed by scanning an anthropomorphic cerebral angiographic phantom using a benchtop PCCT system and a commercial MDCT system. The experimental MIP results consistently demonstrated that compared with MDCT, PCCT provides superior vessel conspicuity and reduced artifactual stenosis.
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Affiliation(s)
- Evan Cary Harvey
- Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705, United States of America
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6
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Baliyan V, Shaqdan K, Hedgire S, Ghoshhajra B. Vascular computed tomography angiography technique and indications. Cardiovasc Diagn Ther 2019; 9:S14-S27. [PMID: 31559151 DOI: 10.21037/cdt.2019.07.04] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Non-invasive cross-sectional imaging techniques play a crucial role in the assessment of the vascular disease processes. Computed tomography angiography (CTA) is an imaging method of choice for a wide range of vascular diseases that span across different vascular territories. A diagnostic quality CTA requires a robust imaging protocol tailored according to the physiologic state and vascular area of interest. This review article is aimed to provide an overview of the technical considerations and clinical applications of CTA.
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Affiliation(s)
- Vinit Baliyan
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Khalid Shaqdan
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Sandeep Hedgire
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Brian Ghoshhajra
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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7
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Anatomy Visualizations Using Stereopsis: Current Methodologies in Developing Stereoscopic Virtual Models in Anatomical Education. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019. [PMID: 31338777 DOI: 10.1007/978-3-030-19385-0_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
Technology for developing three-dimensional (3D) virtual models in anatomical sciences education has seen a great improvement in recent years. Various data used for creating stereoscopic virtual models have also been constantly improving. This paper focuses specifically on the methodologies of creating stereoscopic virtual models and the techniques and materials used in developing stereoscopic virtual models from both our previous studies and other published literature. The presentation and visualization of stereoscopic models are highlighted, and the benefits and limitations of stereoscopic models are discussed. The practice of making 3D measurements on the lengths, angles, and volumes of models can potentially be used to help predict typical measurement parameters of anatomical structures and for the placement of surgical instruments. Once stereoscopic virtual models have been constructed, their visualization and presentation can be implemented in anatomy education and clinical surgical trainings.
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Dunet V, Bernasconi M, Hajdu SD, Meuli RA, Daniel RT, Zerlauth JB. Impact of metal artifact reduction software on image quality of gemstone spectral imaging dual-energy cerebral CT angiography after intracranial aneurysm clipping. Neuroradiology 2017; 59:845-852. [DOI: 10.1007/s00234-017-1871-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 06/19/2017] [Indexed: 10/19/2022]
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9
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Lin A, Rawal S, Agid R, Mandell DM. Cerebrovascular Imaging: Which Test is Best? Neurosurgery 2017; 83:5-18. [DOI: 10.1093/neuros/nyx325] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 05/12/2017] [Indexed: 11/12/2022] Open
Abstract
Abstract
Optimal diagnosis and characterization of cerebrovascular disease requires selection of the appropriate imaging exam for each clinical situation. In this review, we focus on intracranial arterial disease and discuss the techniques in current clinical use for imaging the blood vessel lumen and blood vessel wall, and for mapping cerebral hemodynamic impairment at the tissue level. We then discuss specific strategies for imaging intracranial aneurysms, arteriovenous malformations, dural arterial venous fistulas, and arterial steno-occlusive disease.
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Affiliation(s)
- Amy Lin
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Sapna Rawal
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Ronit Agid
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Daniel M Mandell
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital and the University of Toronto, Toronto, Ontario, Canada
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10
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Dual-Energy Computed Tomography Angiography of the Head and Neck With Single-Source Computed Tomography. Invest Radiol 2016; 51:618-23. [DOI: 10.1097/rli.0000000000000290] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Jia B, Scalzo F, Agbayani E, Woolf GW, Liu L, Miao Z, Liebeskind DS. Multimodal CT techniques for cerebrovascular and hemodynamic evaluation of ischemic stroke: occlusion, collaterals, and perfusion. Expert Rev Neurother 2016; 16:515-25. [PMID: 26967556 DOI: 10.1586/14737175.2016.1165094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Neuroimaging of cerebrovascular status and hemodynamics has vastly improved our understanding of stroke mechanisms and provided information for therapeutic decision-making. CT techniques are the most commonly used techniques due to wide availability, rapid acquisition and acceptable tolerance. Numerous multimodal CT techniques have been developed in the last few years. We summarize and explain the various multimodal CT acquisition techniques within three categories based on the scanning mode, namely static mode (single-phase CTA), multiple static mode (multi-phase CTA) and continuous mode (CT perfusion and dynamic CTA). Post-processing methods based on different acquisition modes are also introduced in an easy manner by focusing on the information extracted and products generated. We also describe the applications for these techniques along with their advantages and disadvantages.
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Affiliation(s)
- Baixue Jia
- a Department of Neuroradiology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China.,b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China
| | - Fabien Scalzo
- e Neurovascular Imaging Research Core , UCLA Stroke Center, University of California , Los Angeles , CA
| | - Elijah Agbayani
- f Henry Samueli School of Engineering and Applied Science , Computer Science Department, University of California , Los Angeles , CA , USA
| | - Graham W Woolf
- e Neurovascular Imaging Research Core , UCLA Stroke Center, University of California , Los Angeles , CA
| | - Liping Liu
- b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China.,g Department of Neurology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China
| | - Zhongrong Miao
- a Department of Neuroradiology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China.,b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China
| | - David S Liebeskind
- h Department of Neurology , Stroke Center, University of California , Los Angeles , CA , USA
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12
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Cui D, Lynch JC, Smith AD, Wilson TD, Lehman MN. Stereoscopic vascular models of the head and neck: A computed tomography angiography visualization. ANATOMICAL SCIENCES EDUCATION 2016; 9:179-85. [PMID: 25929248 DOI: 10.1002/ase.1537] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 04/10/2015] [Accepted: 04/12/2015] [Indexed: 05/26/2023]
Abstract
Computer-assisted 3D models are used in some medical and allied health science schools; however, they are often limited to online use and 2D flat screen-based imaging. Few schools take advantage of 3D stereoscopic learning tools in anatomy education and clinically relevant anatomical variations when teaching anatomy. A new approach to teaching anatomy includes use of computed tomography angiography (CTA) images of the head and neck to create clinically relevant 3D stereoscopic virtual models. These high resolution images of the arteries can be used in unique and innovative ways to create 3D virtual models of the vasculature as a tool for teaching anatomy. Blood vessel 3D models are presented stereoscopically in a virtual reality environment, can be rotated 360° in all axes, and magnified according to need. In addition, flexible views of internal structures are possible. Images are displayed in a stereoscopic mode, and students view images in a small theater-like classroom while wearing polarized 3D glasses. Reconstructed 3D models enable students to visualize vascular structures with clinically relevant anatomical variations in the head and neck and appreciate spatial relationships among the blood vessels, the skull and the skin.
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Affiliation(s)
- Dongmei Cui
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, Mississippi
| | - James C Lynch
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, Mississippi
| | - Andrew D Smith
- Department of Radiology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Timothy D Wilson
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Corps for Research of Instructional and Perceptual Technologies (CRIPT), Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Michael N Lehman
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, Mississippi
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Harki J, Plompen EPC, van Noord D, Hoekstra J, Kuipers EJ, Janssen HLA, Tjwa ETTL. GI ischemia in patients with portal vein thrombosis: a prospective cohort study. Gastrointest Endosc 2016; 83:627-36. [PMID: 26324386 DOI: 10.1016/j.gie.2015.07.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 07/05/2015] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS GI ischemia is a concerning adverse event of portal vein thrombosis (PVT). Minimally invasive techniques, such as visible light spectroscopy (VLS), have greatly improved the ability to diagnose GI ischemia. The aim of this study was to assess the clinical presentation and characteristics of GI ischemia in patients with PVT. METHODS Patients with noncirrhotic, nonmalignant PVT were included in this prospective cohort study. Clinical symptoms of GI ischemia were assessed by a structured questionnaire, VLS, and radiologic evaluation of the mesenteric vasculature. VLS measurements were compared with those in patients with cirrhosis and with a reference population. RESULTS We included 15 patients with chronic PVT and 1 patient with acute PVT (median age 46.1 years [interquartile range [IQR], 30.9-53.7]; 44% male). Decreased mucosal oxygenation in at least 1 location of the GI tract was found in 12 patients (75%). Compared with the reference population (median 60.0 [IQR, 56.2-61.7]), VLS measurements were mostly decreased in the descending duodenum in patients with PVT (median 55.5 [IQR, 52.3-58.8]; P = .02) and patients with cirrhosis (median 52.0 [IQR, 46.5-54.0], P = .003). Symptoms typical for GI ischemia, such as postprandial pain and exercise-induced pain, were reported in 10 patients (63%) with PVT. In patients with extension of thrombosis into the superior mesenteric vein and splenic vein and/or presence of hypercoagulability, decreased VLS measurements were observed compared with historical control subjects. CONCLUSIONS In patients with chronic PVT, GI ischemia is frequent. VLS enables objective and quantitative determination of GI mucosal ischemia. Onset of abdominal symptoms such as postprandial pain should prompt the physician to re-evaluate extent, cause, and treatment of PVT.
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Affiliation(s)
- Jihan Harki
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Elisabeth P C Plompen
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Désirée van Noord
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Jildou Hoekstra
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Ernst J Kuipers
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands; Department of Internal Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Harry L A Janssen
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands; Toronto Centre for Liver Disease, Toronto Western and General Hospital, University Health Network, Toronto, Ontario, Canada
| | - Eric T T L Tjwa
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
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14
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Clinical utility and cost-effectiveness of CT-angiography in the diagnosis of nontraumatic subarachnoid hemorrhage. Neuroradiology 2014; 56:817-24. [DOI: 10.1007/s00234-014-1406-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 07/11/2014] [Indexed: 12/21/2022]
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15
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Implications of Surface-Rendered Facial CT Images in Patient Privacy. AJR Am J Roentgenol 2014; 202:1267-71. [DOI: 10.2214/ajr.13.10608] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Li Q, Lv F, Wei Y, Luo T, Xie P. Automated subtraction CT angiography for visualization of the whole brain vasculature: a feasibility study. Acad Radiol 2013; 20:1009-14. [PMID: 23746383 DOI: 10.1016/j.acra.2013.04.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/22/2013] [Accepted: 04/25/2013] [Indexed: 11/16/2022]
Abstract
RATIONALE AND OBJECTIVES To develop an automated computed tomography angiography (CTA) imaging protocol that allows visualization of the whole brain vasculature and evaluate the clinical usefulness of the technique for delineation of intracranial vessels in patients with cerebrovascular disorders. MATERIALS AND METHODS We prospectively included 100 patients who underwent automated subtraction CTA for suspected cerebrovascular disorders. The nonenhanced and contrast enhanced scans were obtained with the same table feeding speed. The x-ray tube start angles of the two scans were matched to enable accurate registration and subtraction of the CTA datasets. Subtracted CTA datasets were reformatted as three-dimensional volume rendering and maximum intensity projection images for further review. Two independent readers assessed the quality of subtraction and delineation of intracranial vessels. The visibility of ophthalmic arteries was also assessed. RESULTS Subtraction was successful in all patients. The image quality of bone removal was rated excellent in 95 patients, with no or minimal bone remnants. Incomplete bone removal was observed in five patients because of severe motions between the scans. In 97 of 100 patients, arterial segments at the circle of Willis could be clearly visualized. Excellent delineation of bilateral ophthalmic arteries was possible in 81 of 100 patients. CONCLUSIONS The whole brain vasculature would be clearly visualized by using the optimized automated CTA protocol. Our automated, single-source, dual-energy subtraction CTA protocol is a fully automated subtraction method that is capable of delineating major intracranial vessels as well as very small arteries.
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Affiliation(s)
- Qi Li
- Department of Neurology, The First Affiliated Hospital, Chongqing Medical University, 1 Yixueyuan Road, Yuzhong District, 400016 Chongqing, China
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Etame AB, Bentley JN, Pandey AS. Acute expansion of an asymptomatic posterior communicating artery aneurysm resulting in oculomotor nerve palsy. BMJ Case Rep 2013; 2013:bcr-2013-010134. [PMID: 23761613 DOI: 10.1136/bcr-2013-010134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Acute expansion of an intracranial aneurysm is an extremely rare event. In this report, we describe the unusual radiographic documentation of acute expansion of a posterior communicating artery (PCOM) aneurysm from 4 to 8 mm, resulting in complete oculomotor nerve palsy. A 40-year-old man was admitted to our institution with a 3-week history of persistent occipital headaches but was otherwise neurologically intact. CT angiography demonstrated a 4 mm left PCOM aneurysm. Digital subtraction angiography performed several hours following presentation demonstrated an expansion in aneurysm size to 8 mm with new-onset complete oculomotor nerve palsy. The aneurysm was successfully obliterated by clip ligation. Although growth in aneurysm size is often a progressive phenomenon, acute expansions of aneurysms can occur.
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Affiliation(s)
- Arnold B Etame
- Department of Neurosurgery, University of Michigan, Ann Arbor, Michigan, USA
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Anatomical variations of the anterior cerebral arterial circle visualized by multidetector computed tomography angiography: Comparison with 3D rotational angiography. J Neuroradiol 2013; 40:112-20. [DOI: 10.1016/j.neurad.2012.05.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 05/16/2012] [Accepted: 05/17/2012] [Indexed: 11/19/2022]
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Cook SC, Hickey J, Maul TM, Zumberge N, Krieger EV, Valente AM, Zaidi AN, Daniels CJ. Assessment of the Cerebral Circulation in Adults with Coarctation of the Aorta. CONGENIT HEART DIS 2012; 8:289-95. [DOI: 10.1111/chd.12024] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/08/2012] [Indexed: 11/26/2022]
Affiliation(s)
- Stephen C. Cook
- The Adult Congenital Heart Disease Center; Children's Hospital of Pittsburgh of UPMC; Pittsburgh; Pa; USA
| | - Jenne Hickey
- Department of Cardiology; The Columbus Ohio Adult Congenital Heart Program (COACH); Columbus; Ohio; USA
| | - Timothy M. Maul
- Department of Cardiothoracic Surgery; University of Pittsburgh; Pittsburgh; Pa; USA
| | - Nicholas Zumberge
- Diagnostic Radiology; Nationwide Children's Hospital; Columbus; Ohio; USA
| | - Eric V. Krieger
- Department of Cardiology; Boston Adult Congenital Heart Program; Boston; Mass; USA
| | - Anne Marie Valente
- Department of Cardiology; Boston Adult Congenital Heart Program; Boston; Mass; USA
| | - Ali N. Zaidi
- Department of Cardiology; The Columbus Ohio Adult Congenital Heart Program (COACH); Columbus; Ohio; USA
| | - Curt J. Daniels
- Department of Cardiology; The Columbus Ohio Adult Congenital Heart Program (COACH); Columbus; Ohio; USA
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Zhang H, Hou C, Zhou Z, Zhang H, Zhou G, Zhang G. Evaluating of small intracranial aneurysms by 64-detector CT Angiography: a comparison with 3-dimensional rotation DSA or surgical findings. J Neuroimaging 2012; 24:137-43. [PMID: 23228080 DOI: 10.1111/j.1552-6569.2012.00747.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 06/17/2012] [Accepted: 07/01/2012] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND PURPOSE The diagnostic performance of 64-detector computed tomographic angiography (CTA) for detection of small intracranial aneurysms (SIAs) was evaluated. METHODS In this prospective study, 112 consecutive patients underwent 64-detector CTA before volume-rendering rotation digital subtraction angiography (VR-RDSA) or surgery. VR-RDSA or intraoperative findings or both were used as the gold standards. The accuracy, sensitivity, specificity, and positive predictive values (PPV) and negative predictive values (NPV), as measures to detect or rule out SIAs, were determined by patient-based and aneurysm size-based evaluations. RESULTS The reference standard methods revealed 84 small aneurysms in 71 patients. The results of patient-based 64-detector CTA evaluation for SIAs were: accuracy, 98.2%; sensitivity, 98.6%; specificity, 97.6%; PPV, 98.6%; and NPV, 97.6%. The aneurysm-based evaluation results were: accuracy, 96.8%; sensitivity, 97.6%; specificity, 95.1%; PPV, 97.6%; and NPV, 95.1%. Two false-positive and two false-negative findings for aneurysms <3 mm in size occurred in the 64-detector CTA analysis. CONCLUSION The diagnostic performance of 64-detector CTA did not improve much compared with 16-detector CTA for detecting SIAs, especially for very small aneurysms. VR-RDSA is still necessary for patients with a history of subarachnoid hemorrhage if the CTA findings are negative.
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Affiliation(s)
- He Zhang
- Department of Radiology, Shanghai First People's Hospital, Medical College, Shanghai Jiao Tong University, Shanghai, China
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Brunner F, Tomandl B, Hanken K, Hildebrandt H, Kastrup A. Impact of Collateral Circulation on Early Outcome and Risk of Hemorrhagic Complications after Systemic Thrombolysis. Int J Stroke 2012; 9:992-8. [DOI: 10.1111/j.1747-4949.2012.00922.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Background In stroke patients, collateral flow can rapidly be assessed on computed tomography angiography (CTA). Aims In this study, the impact of baseline collaterals on early outcome and risk of symptomatic intracerebral hemorrhages after systemic thrombolysis in patients with proximal arterial occlusions within the anterior circulation were analyzed. Methods Collateralization scores were determined on the CT angiography source images (0 = absent; 1 ≤ 50%, 2 > 50% but <100%, and 3 = 100% collateral filling) of patients with distal intracranial carotid artery and/or M1 segment occlusions treated from 2008 to December 2011. A collateral score of 0 to 1 was designated as poor and 2 to 3 as good collateral vessel status. Outcome variables included in hospital mortality, favorable outcome at discharge (modified Rankin score ≤ 2), and rates of symptomatic intracerebral hemorrhage based on the European–Australasian Acute Stroke Study II definition. Results Among 246 subjects (mean age of 74 years; median National Institutes of Health Stroke Scale N at admission 14), 205 patients (83%) had good collaterals, whereas 41 patients (17%) had poor collaterals, respectively. Patients with poor collaterals had significantly higher rates of in-hospital mortality (41% vs. 12%, P < 0·001), of symptomatic intracerebral hemorrhage (15% vs. 4·9%, P < 0·05) and had significantly lower rates of favorable early clinical outcome (0% vs. 28%, P < 0·001) compared with those with good collaterals. The grade of collateralization was independently associated with in-hospital mortality ( P < 0·001), early clinical outcome ( P < 0·01), and rates of symptomatic intracerebral hemorrhage ( P < 0·01). Conclusion Patients with proximal arterial occlusions within the anterior circulation and poor baseline collaterals have a poor early functional outcome and high rates of symptomatic intracerebral hemorrhage after systemic thrombolysis. Since similar findings have also been reported after endovascular therapy, strategies to improve collateral blood flow should be assessed in this patient population.
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Affiliation(s)
| | - Bernd Tomandl
- Department of Neuroradiology, Klinikum Bremen-Mitte, Bremen; Germany
| | - Katrin Hanken
- Department of Neuroscience, University of Bremen, Bremen, Germany
| | | | - Andreas Kastrup
- Department of Neurology, Klinikum Bremen-Mitte, Bremen; Germany
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Grech R, Grech S, Mizzi A. Intracranial Calcifications. Neuroradiol J 2012; 25:427-51. [DOI: 10.1177/197140091202500406] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Accepted: 06/03/2012] [Indexed: 11/16/2022] Open
Abstract
Brain calcifications are a common radiographic finding. The pathogenesis is diverse and ranges from benign physiological calcifications to a variety of pathological disorders. Whereas certain calcifications are considered an incidental finding, their presence can sometimes be crucial in making a specific diagnosis. Several pathological conditions affecting the brain parenchyma are associated with calcifications and their recognition and location might help in narrowing the differential. Knowledge of physiological calcifications is essential to avoid misinterpretation. This review illustrates a broad spectrum of CNS disorders associated with calcifications, and tries to highlight the salient radiological findings.
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Affiliation(s)
- R. Grech
- Waterford Regional Hospital; Waterford, Ireland
| | - S. Grech
- Mater Dei Hospital; Msida, Malta
| | - A. Mizzi
- Mater Dei Hospital; Msida, Malta
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Millon D, Derelle AL, Omoumi P, Tisserand M, Schmitt E, Foscolo S, Anxionnat R, Bracard S. Nontraumatic subarachnoid hemorrhage management: evaluation with reduced iodine volume at CT angiography. Radiology 2012; 264:203-9. [PMID: 22627598 DOI: 10.1148/radiol.12111384] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To evaluate the technical quality and the diagnostic performance of a protocol with use of low volumes of contrast medium (25 mL) at 64-detector spiral computed tomography (CT) in the diagnosis and management of adult, nontraumatic subarachnoid hemorrhage (SAH). MATERIALS AND METHODS This study was performed outside the United States and was approved by the institutional review board. Intracranial CT angiography was performed in 73 consecutive patients with nontraumatic SAH diagnosed at nonenhanced CT. Image quality was evaluated by two observers using two criteria: degree of arterial enhancement and venous contamination. The two independent readers evaluated diagnostic performance (lesion detection and correct therapeutic decision-making process) by using rotational angiographic findings as the standard of reference. Sensitivity, specificity, and positive and negative predictive values were calculated for patients who underwent CT angiography and three-dimensional rotational angiography. The intraclass correlation coefficient was calculated to assess interobserver concordance concerning aneurysm measurements and therapeutic management. RESULTS All aneurysms were detected, either ruptured or unruptured. Arterial opacification was excellent in 62 cases (85%), and venous contamination was absent or minor in 61 cases (84%). In 95% of cases, CT angiographic findings allowed optimal therapeutic management. The intraclass correlation coefficient ranged between 0.93 and 0.95, indicating excellent interobserver agreement. CONCLUSION With only 25 mL of iodinated contrast medium focused on the arterial phase, 64-detector CT angiography allowed satisfactory diagnostic and therapeutic management of nontraumatic SAH.
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Affiliation(s)
- Domitille Millon
- Department of Diagnostic and Therapeutic Neuroradiology, Centre Hospitalo Universitaire Nancy, Department of Anatomy, Faculty of Medicine, Université de Lorraine, Vandoeuvre Les Nancy, France.
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Donmez H, Serifov E, Kahriman G, Mavili E, Durak AC, Menkü A. Comparison of 16-row multislice CT angiography with conventional angiography for detection and evaluation of intracranial aneurysms. Eur J Radiol 2011; 80:455-61. [DOI: 10.1016/j.ejrad.2010.07.012] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2010] [Accepted: 07/13/2010] [Indexed: 12/01/2022]
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González-Darder J, Verdú-López y F, Quilis-Quesada V. Manejo y tratamiento microquirúrgico de las dilataciones infundibulares de la arteria comunicante posterior. Serie de nueve casos y revisión de la literatura. Neurocirugia (Astur) 2011. [DOI: 10.1016/s1130-1473(11)70026-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Dual energy CTA of the supraaortic arteries: Technical improvements with a novel dual source CT system. Eur J Radiol 2010; 76:e6-12. [DOI: 10.1016/j.ejrad.2009.09.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 09/14/2009] [Accepted: 09/18/2009] [Indexed: 11/21/2022]
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Niederberger E, Gauvrit JY, Morandi X, Carsin-Nicol B, Gauthier T, Ferré JC. Anatomic variants of the anterior part of the cerebral arterial circle at multidetector computed tomography angiography. J Neuroradiol 2010; 37:139-47. [PMID: 20346510 DOI: 10.1016/j.neurad.2009.12.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 12/10/2009] [Accepted: 12/14/2009] [Indexed: 10/19/2022]
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Vogl TJ, Harth M, Siebenhandl P. Different imaging techniques in the head and neck: Assets and drawbacks. World J Radiol 2010; 2:224-9. [PMID: 21160634 PMCID: PMC2999322 DOI: 10.4329/wjr.v2.i6.224] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 05/15/2010] [Accepted: 05/22/2010] [Indexed: 02/06/2023] Open
Abstract
In this review, the gold standard imaging techniques for the head and neck and the latest upcoming techniques are presented, by comparing computed tomography (CT), magnetic resonance imaging and positron emission tomography-CT, as well as ultrasound, depending on the examined area. The advantages and disadvantages of each examination protocol are presented. This article illustrates the connection between the imaging technique and the examined area. Therefore, the head and neck area is divided into different sections such as bony structures, nervous system, mucous membranes and squamous epithelium, glandular tissue, and lymphatic tissue and vessels. Finally, the latest techniques in the field of head and neck imaging such as multidetector CT, dual-energy CT, flash CT, magnetic resonance angiography, spectroscopy, and diffusion tensor tractography using 3 tesla magnetic resonance are discussed.
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Chang HH, Duckwiler GR, Valentine DJ, Chu WC. Computer-assisted extraction of intracranial aneurysms on 3D rotational angiograms for computational fluid dynamics modeling. Med Phys 2010; 36:5612-21. [PMID: 20095274 DOI: 10.1118/1.3260841] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Three-dimensional rotational angiography (3DRA) is an evolving imaging procedure from traditional digital subtraction angiography and is gaining much interest for detecting intracranial aneurysms. Computational fluid dynamics (CFD) modeling plays an important role in understanding the biomechanical properties and in facilitating the prediction of aneurysm rupture. A successful computational study relies on an accurate description of the vascular geometry that is obtained from volumetric images. METHODS The authors propose a new aneurysm segmentation algorithm to facilitate the study of CFD. This software combines a region-growing segmentation method with the 3D extension of a deformable contour based on a charged fluid model. A charged fluid model essentially consists of a set of charged elements that are governed by the nature of electrostatics. The approach requires no prior knowledge of anatomic structures and automatically segments the vasculature after the end-user selects a vessel section in a plane image. RESULTS Experimental results on 15 cases indicate that aneurysm structures were effectively segmented and in good agreement with manual delineation outcomes. In comparison with the existing methods, the algorithm provided a much higher overlap index with respect to the ground truth. Furthermore, the outcomes of the proposed approach achieved a clean representation of vascular structures that is advantageous for hemodynamics analyses. CONCLUSIONS A new aneurysm segmentation framework in an attempt to automatically segment vascular structures in 3DRA image volumes has been developed. The proposed algorithm demonstrated promising performance and unique characteristics to adequately segment aneurysms in 3DRA image volumes for further study in computational fluid dynamics.
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Affiliation(s)
- Herng-Hua Chang
- Institute of Biomedical Engineering, National Yang-Ming University, 155 Linong Street, Section 2, Beitou, Taipei 112, Taiwan
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Wang YC, Liu YC, Hsieh TC, Lee ST, Li ML. Aneurysmal subarachnoid hemorrhage diagnosis with computed tomographic angiography and OsiriX. Acta Neurochir (Wien) 2010; 152:263-9; discussion 269. [PMID: 19784547 DOI: 10.1007/s00701-009-0508-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2009] [Accepted: 09/01/2009] [Indexed: 11/28/2022]
Abstract
PURPOSE Recent advances in computed tomographic angiography (CTA) have resulted in its replacing digital subtraction angiography (DSA). However, CTA requires a powerful workstation and experienced technicians for image postprocessing. OsiriX, a free open-source medical imaging software with powerful three-dimensional (3D) capability, enables neurosurgeons to perform 3D rendering without extensive training. In this study, we examined the sensitivity and specificity of CTA with OsiriX as the primary diagnostic tool for intracranial aneurysms. METHOD From May 2006 to March 2009, 121 patients with spontaneous subarachnoid hemorrhage (SAH) underwent CTA. The CTA source images were 3D rendered by neurosurgeons using OsiriX. All the possible locations for aneurysms were carefully reviewed. DSA was performed on every patient in any of the following conditions: for negative CTA findings, after surgical clipping of aneurysms or before transarterial embolization of aneurysms. RESULT Of the 121 patients, 8 were excluded because DSA data were not available. In the remaining 113 patients, 20 patients had negative CTA findings. CTA with OsiriX detected 106 aneurysms in 93 patients, of which 103 were confirmed by DSA or postoperative DSA; 3 infundibular dilated pouches of small arteries were mistaken for aneurysms. Two anterior communicating artery aneurysms (1.5 mm and 1 mm) were missed by CTA from among all 113 patients. The sensitivity and specificity of CTA for detecting aneurysms on a per-patient basis were 98.9% and 100%, respectively. The sensitivity and specificity of CTA for detecting aneurysms on a per-aneurysm basis for detecting aneurysms were 98.1% and 86.3%, respectively. CONCLUSION CTA with OsiriX enables accurate detection of intracranial aneurysms. Cerebral DSA should be reserved for those patients with negative CTA findings.
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Affiliation(s)
- Yi-Chou Wang
- Department of Neurosurgery, Chang Gung University & Chang Gung Memorial Hospital, Taoyuan, Taiwan, Republic of China.
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Gerardin E, Daumas-Duport B, Tollard E, Langlois O, Dacher JN, Clavier E, Proust F. Usefulness of multislice computerized tomography angiography in preoperative diagnosis of ruptured cerebral aneurysms. J Neuroradiol 2009; 36:278-84. [DOI: 10.1016/j.neurad.2009.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 07/02/2009] [Accepted: 07/29/2009] [Indexed: 11/28/2022]
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CT emergencies. Emerg Radiol 2009. [DOI: 10.1017/cbo9780511691935.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Li Q, Lv F, Li Y, Luo T, Li K, Xie P. Evaluation of 64-Section CT Angiography for Detection and Treatment Planning of Intracranial Aneurysms by Using DSA and Surgical Findings. Radiology 2009; 252:808-15. [DOI: 10.1148/radiol.2523081911] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ferguson SD, Rosen DS, Bardo D, Macdonald RL. Arterial diameters on catheter and computed tomographic angiography. World Neurosurg 2009; 73:165-73; discussion e25. [PMID: 20860954 DOI: 10.1016/j.surneu.2008.12.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2008] [Accepted: 12/09/2008] [Indexed: 11/29/2022]
Abstract
BACKGROUND The diagnosis of cerebral vasospasm is hampered by lack of an accurate, noninvasive test. Computed tomographic angiography (CTA) may be useful but the correlation between arterial diameters determined from catheter digital subtraction angiography (DSA) and CTA over a range of artery sizes would need to be determined to show this. The purpose of this study was to determine the correlation between artery diameters measured on DSA and multidetector CTA. METHODS Two hundred forty artery diameters were measured in DSA and CTA from 46 patients who underwent both studies within 12 hours of each other. Axial cross section, maximum intensity projection, and volume-rendered images were measured and compared by linear correlation. Two independent readers measured CTA diameters to determine interobserver variability by linear correlation. Values also were categorized and compared by χ(2) and κ statistics. Analysis was repeated with unmeasurable arteries assigned a value of 0. RESULTS There were significant correlations between arterial diameters measured on DSA and those from CTA measured by any method (R(2) ranging from 0.45 to 0.76, P < .0001), although there was a tendency for the slope of this relationship to be less than 1, indicating underestimation of diameter of large and overestimation of diameter of small arteries with CTA. Computed tomographic angiography diameters also correlated significantly between the 2 reviewers with higher values often when unmeasureable arteries were assigned a value of 0 (κ = 0.23-0.55, P < .0001). CONCLUSION Arterial diameters measured on multidetector CTA correlate well with those determined from DSA and should permit use of CTA for quantitative study of cerebral vasospasm and other conditions requiring accurate measurement of arterial diameters. The limitation of CTA remains the inability to measure some arteries due to artifact.
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Affiliation(s)
- Sherise D Ferguson
- Section of Neurosurgery, Department of Surgery, University of Chicago Medical Center and Pritzker School of Medicine, Chicago, USA
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Kokkinis C, Vlychou M, Zavras GM, Hadjigeorgiou GM, Papadimitriou A, Fezoulidis IV. The role of 3D-computed tomography angiography (3D-CTA) in investigation of spontaneous subarachnoid haemorrhage: comparison with digital subtraction angiography (DSA) and surgical findings. Br J Neurosurg 2009; 22:71-8. [DOI: 10.1080/02688690701713862] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Halász S, Puskás T. The importance of multidetector computed tomography in the vascular imaging. Orv Hetil 2009; 150:1351-60. [DOI: 10.1556/oh.2009.28664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A több detektorsoros spirál-CT-berendezések és a hozzájuk tartozó speciális rekonstrukciós szoftverek bevezetése lehetővé tette az erek jó minőségű CT-vizsgálatát.
Cél és módszerek:
A szerzők ismertetik a CT-angiográfiai vizsgálatok elvét, technikáját, amelyet az elmúlt három évben közel 700 saját betegükön végzett vizsgálataik eredményeivel, tapasztalataival egészítenek ki. Bemutatják a CT-angiográfia jelentőségét, valamint annak más vascularis képalkotó eljárások helyett vagy melletti alkalmazhatóságát.
Következtetések:
A CT-angiográfia gyors, noninvazív vizsgálati módszer, amellyel – önmagában vagy más vizsgálattal kiegészítve – pontos diagnózis állítható fel.
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Affiliation(s)
- Szabolcs Halász
- 1 Vas Megyei Markusovszky Kórház Nonprofit Zrt. Radiológiai Osztály, Diagnosztikai Részleg Szombathely Szent Flórián krt. 39. 9700
| | - Tamás Puskás
- 1 Vas Megyei Markusovszky Kórház Nonprofit Zrt. Radiológiai Osztály, Diagnosztikai Részleg Szombathely Szent Flórián krt. 39. 9700
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Lell MM, Kramer M, Klotz E, Villablanca P, Ruehm SG. Carotid Computed Tomography Angiography With Automated Bone Suppression. Invest Radiol 2009; 44:322-8. [DOI: 10.1097/rli.0b013e31819e8ad9] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cranial computed tomography angiography with automated bone subtraction: a feasibility study. Invest Radiol 2009; 44:38-43. [PMID: 18836384 DOI: 10.1097/rli.0b013e31818c3d6b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Computed tomography angiography (CTA) is becoming an increasingly accepted noninvasive alternative to catheter angiography. To display continuous vessel contours without superimposed bone in a similar manner, postprocessing of the CTA data is necessary. Threshold-based techniques often fail in regions of close vessel-bone contact, which frequently requires user interaction to optimize the results. This may be laborious and time consuming. The aim of this study was to assess the feasibility of a fully automated algorithm for bone subtraction in cranial CT angiography. MATERIALS AND METHODS Forty-nine patients underwent cranial CT angiography on 64 slice CT systems. Two scans were performed, one before (mask) and one after (CTA) contrast agent administration. Images were processed with commercially available subtraction software. Two examiners rated the success of overall bone removal and image quality of different vessel segments (n = 34) with a 4-point scale (1 = poor; 4 = excellent); original CTA data served as the reference. RESULTS Subtraction was performed successfully in all cases, overall subtraction quality was high (82% of cases were rated good or excellent). Only 50 of 1666 arterial segments (3%) were rated nondiagnostic. No relevant artificial stenoses of the internal carotid artery (ICA) or vertebral artery along their way through the skull base were detected when comparing CTA source images to bone subtraction computed tomography angiography (BSCTA) images. CONCLUSIONS Automatic subtraction provides diagnostic image quality for 3D visualization of intracranial vessels, free from over projecting bone in a fully automatic way. Aneurysms can be evaluated from all angles, and ICA stenoses at the skull base were easily visualized.
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Delgado Almandoz JE, Schaefer PW, Forero NP, Falla JR, Gonzalez RG, Romero JM. Diagnostic accuracy and yield of multidetector CT angiography in the evaluation of spontaneous intraparenchymal cerebral hemorrhage. AJNR Am J Neuroradiol 2009; 30:1213-21. [PMID: 19342546 DOI: 10.3174/ajnr.a1546] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND PURPOSE Multidetector CT angiography (MDCTA) is emerging as the favored initial diagnostic examination in the evaluation of patients presenting with spontaneous intraparenchymal hemorrhage (IPH). This study aims to evaluate the diagnostic accuracy and yield of MDCTA for the detection of vascular etiologies in adult patients presenting to the emergency department with IPH. MATERIALS AND METHODS We conducted a retrospective study of 623 consecutive adult patients presenting to the emergency department with IPH, who were evaluated with MDCTA during a 9-year period. CT angiograms were reviewed by 2 neuroradiologists to determine the IPH site and the presence of a vascular etiology. Patients with associated subarachnoid hemorrhage in the basal cisterns were excluded from the study. Medical records were reviewed for risk factors and correlation with final diagnosis. The diagnostic accuracy of MDCTA compared with conventional angiography, intraoperative evaluation, and pathologic findings was determined, when available. Multiple-variable logistic regression analysis was performed to determine clinical and radiologic factors that predict a higher yield of MDCTA. RESULTS MDCTA demonstrated a vascular etiology in 91 patients (14.6%), with a sensitivity of 96%, specificity of 99%, and diagnostic accuracy of 98%. We found independent, statistically significant higher yields of MDCTA in patients with the following characteristics: 1) age younger than 46 years (47%); 2) lobar (20%) or infratentorial (16%) IPH, especially lobar IPH with associated intraventricular hemorrhage (25%); 3) female sex (18%); or 4) neither known hypertension nor impaired coagulation at presentation (33%). CONCLUSIONS MDCTA is an accurate diagnostic examination in the evaluation of adult patients presenting with spontaneous IPH and should be performed in all patients with the aforementioned clinical and radiologic characteristics.
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Affiliation(s)
- J E Delgado Almandoz
- Division of Neuroradiology, Radiology Department, Massachusetts General Hospital, Boston, MA 02114, USA.
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Güresir E, Beck J, Vatter H, Setzer M, Gerlach R, Seifert V, Raabe A. SUBARACHNOID HEMORRHAGE AND INTRACEREBRAL HEMATOMA. Neurosurgery 2008; 63:1088-93; discussion 1093-4. [DOI: 10.1227/01.neu.0000335170.76722.b9] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
OBJECTIVE
To analyze the incidence and impact of an intracerebral hematoma (ICH) on treatment and outcome in patients with aneurysmal subarachnoid hemorrhage.
METHODS
Data of 585 consecutive patients with subarachnoid hemorrhage from June 1999 to December 2005 were prospectively entered in a database. ICH was diagnosed and size was measured by computed tomographic scan before aneurysm occlusion. Fifty patients (8.5%) presented with an ICH larger than 50 cm3. The treatment decision (coil, clip, or hematoma evacuation) was based on an interdisciplinary approach. Patients were stratified into good (Hunt and Hess Grades I–III) versus poor (Hunt and Hess Grades IV and V) grade, and outcome was assessed according to the modified Rankin Scale at 6 months.
RESULTS
Overall, 358 patients presented in good grade, with 4 of them having ICH (1.1%); and 227 patients presented in poor grade, with 46 of them having ICH (20.3%, P < 0.01). In good-grade patients with an ICH (n = 4), a favorable outcome (modified Rankin Scale score of 0–2) was achieved in 1 patient (25%), and in 246 patients (75%) without an ICH (P = 0.053; odds ratio, 0.11). A favorable outcome was achieved in 5 poor-grade patients (12.8%) with an ICH and in 40 patients (23.7%) without an ICH (P = 0.19; odds ratio, 0.47). Time to treatment was significantly shorter in patients with an ICH than without an ICH (median, 7 versus 26 h; P < 0.001) and shortest in patients with favorable outcome (3.5 hours; P < 0.01).
CONCLUSION
The current data confirm that the presence of an ICH is a predictor of unfavorable outcome. However, despite large ICHs, a significant number of patients have a good outcome. To achieve a favorable outcome, ultra-early treatment with hematoma evacuation and aneurysm obliteration seems to be mandatory.
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Affiliation(s)
- Erdem Güresir
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Jürgen Beck
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Hartmut Vatter
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Matthias Setzer
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Rüdiger Gerlach
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Volker Seifert
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
| | - Andreas Raabe
- Department of Neurosurgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
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Romijn M, Gratama van Andel HAF, van Walderveen MA, Sprengers ME, van Rijn JC, van Rooij WJ, Venema HW, Grimbergen CA, den Heeten GJ, Majoie CB. Diagnostic accuracy of CT angiography with matched mask bone elimination for detection of intracranial aneurysms: comparison with digital subtraction angiography and 3D rotational angiography. AJNR Am J Neuroradiol 2008; 29:134-9. [PMID: 17928381 DOI: 10.3174/ajnr.a0741] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Our aim was to determine the diagnostic accuracy of multisection CT angiography combined with matched mask bone elimination (CTA-MMBE) for detection of intracranial aneurysms compared with digital subtraction angiography (DSA) and 3D rotational angiography (3DRA). MATERIALS AND METHODS Between January 2004 and February 2006, 108 patients who presented with clinically suspected subarachnoid hemorrhage underwent both CTA-MMBE and DSA for diagnosis of an intracranial aneurysm. Two neuroradiologists, independently, evaluated 27 predefined vessel locations in the CTA-MMBE images for the presence of an aneurysm. After consensus, diagnostic accuracy of CTA was calculated per predefined location and per patient. Interobserver agreement was calculated with kappa statistics. RESULTS In 88 patients (81%), 117 aneurysms (82 ruptured, 35 unruptured) were present on DSA. CTA-MMBE detected all ruptured aneurysms except 1. Overall specificity, sensitivity, positive predictive value, and negative predictive value of CTA-MMBE were 0.99, 0.90, 0.98, and 0.95 per patient and 0.91, 1.00, 0.97, and 0.99 per location, respectively. Sensitivity was 0.99 for aneurysms >/=3 mm and 0.38 for aneurysms <3 mm. Interobserver agreement for aneurysm detection was excellent (kappa value of 0.92 per location and 0.80 per patient). CONCLUSION CTA-MMBE is accurate in detecting intracranial aneurysms in any projection without overprojecting bone. CTA-MMBE has limited sensitivity in detecting very small aneurysms. Our data suggest that DSA and 3DRA can be limited to the vessel harboring the ruptured aneurysm before endovascular treatment, after detection of a ruptured aneurysm with CTA.
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Affiliation(s)
- M Romijn
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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Tanrikulu L, Hastreiter P, Troescher-Weber R, Buchfelder M, Naraghi R. Intraoperative three-dimensional visualization in microvascular decompression. J Neurosurg 2007; 107:1137-43. [DOI: 10.3171/jns-07/12/1137] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
The authors systematically analyzed 3D visualization of neurovascular compression (NVC) syndromes in the operating room (OR) during microvascular decompression (MVD).
Methods
A total of 50 patients (26 women and 24 men) with trigeminal neuralgia (TN), hemifacial spasm (HFS), and glossopharyngeal neuralgia (GN) were examined and underwent MVD. Preoperative imaging of the neurovascular structures was performed using constructive interference in the steady state magnetic resonance (CISS MR) imaging, which consisted of 2D image slices. The 3D visualization of the neurovascular anatomy is generated after segmentaion of the CISS MR imaging in combination with direct volume rendering (DVR). The 3D representations were stored on a personal computer (PC) that was mounted on a mobile unit and transferred to the OR. During surgery, 3D visualization was applied by the surgeon with remotely controlled plasma-sterilized devices such as a wireless mouse and keyboard. The position of the 3D visualized neurovascular structures at the PC monitor was determined according to the intraoperative findings observed through the operating microscope.
Results
The system was stable during all neurosurgical procedures, and there were no operative or technical complications. Interactive adjustment of the 3D visualization guided by the view through the microscope permitted observation of the neurovascular relationships at the brainstem. Vessels covered by the cranial nerves could be noninvasively viewed by intraoperative 3D visualization. Postoperatively, the patients with TN and GN experienced pain relief, and the patients with HFS attained resolution of their facial tics. Vascular compression of nerves was explored in all 50 patients during MVD. Intraoperative 3D visualization delineated the compressing vessels and respective cranial nerves in 49 (98%) of 50 patients.
Conclusions
Interactive 3D visualization by DVR of high-resolution MR imaging data offered the opportunity for noninvasive virtual exploration of the neurovascular structures during surgery. An extended global survey of the neurovascular relationships was provided during MVD in each case. The presented method proved to be extremely advantageous for optimizing microneurosurgical procedures, supporting superior safety and improving the operative results when compared with the conventional strategy. This modality proved to be a very valuable teaching instrument and ensured the improvement of neurosurgical quality.
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Affiliation(s)
| | | | - Regina Troescher-Weber
- 2Division of Neuroradiology, Department of Diagnostic Radiology, Friedrich-Alexander-University of Erlangen–Nuremberg, Erlangen, Germany
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Schellinger PD, Richter G, Köhrmann M, Dörfler A. Noninvasive Angiography (Magnetic Resonance and Computed Tomography) in the Diagnosis of Ischemic Cerebrovascular Disease. Cerebrovasc Dis 2007; 24 Suppl 1:16-23. [DOI: 10.1159/000107375] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Taschner CA, Thines L, Lernout M, Lejeune JP, Leclerc X. Treatment decision in ruptured intracranial aneurysms: comparison between multi-detector row CT angiography and digital subtraction angiography. J Neuroradiol 2007; 34:243-9. [PMID: 17761283 DOI: 10.1016/j.neurad.2007.07.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The aim of this study was to determine the accuracy of multi-detector row computed tomography angiography (CTA) for the triage of patients with acutely ruptured aneurysms, and to assess how therapeutic decisions based on this method compared with digital subtraction angiography (DSA). METHODS Twenty-seven consecutive patients with acute subarachnoid hemorrhage were included, and underwent both CTA and DSA. CTA was performed on a 16-detector row CT scanner with a 0.75-mm collimation and a 0.558-beam pitch. Two readers reviewed the CTA data, and two different readers reviewed the DSA data. Aneurysm characteristics were recorded and treatment by surgical clipping or endovascular coil embolization was proposed. RESULTS A total of 24 aneurysms were identified on DSA in 21 patients. Sensitivity and specificity for CTA were 100% and 83%, respectively, on a per-aneurysm-basis. The correlation between DSA and CTA for the determination of sac and neck sizes was very good (r=0.92, and r=0.95, respectively, P<0.0001). Sensitivity and specificity for the detection of arterial branches incorporated into the aneurysmal sac or neck were 50% and 100%, respectively. In three aneurysms, readers judged CTA inappropriate for triage, because peri-aneurysmal branches were not properly visualized. Overall agreement between CTA and DSA regarding the therapeutic decision between surgical clipping and endovascular coil embolization in 24 aneurysms was good (kappa=0.76). CONCLUSION Multi-detector row CTA provides accurate anatomic information for aneurysm location as well as sac and neck sizes; however, the technique appears to have a low sensitivity in detecting branches incorporated into the aneurysmal sac.
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Affiliation(s)
- C-A Taschner
- Department of neuroradiology, hôpital Roger-Salengro, CHRU Lille, University Hospital Lille, France.
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Liu Q, Lu JP, Wang F, Wang L, Tian JM. Three-dimensional Contrast-enhanced MR Angiography of Aortic Dissection: A Pictorial Essay. Radiographics 2007; 27:1311-21. [PMID: 17848693 DOI: 10.1148/rg.275065737] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Aortic dissection is a catastrophic aortic disorder with high morbidity and mortality rates. Prognosis and treatment vary with different types of aortic dissection; therefore, prompt and accurate diagnosis is essential. Ultrasonography is widely available and can be used even in relatively unstable patients. However, it has limited diagnostic accuracy and cannot provide three-dimensional (3D) display images for treatment planning. Both computed tomographic (CT) angiography and 3D contrast material-enhanced magnetic resonance (MR) angiography can accurately demonstrate aortic dissection, with CT having the advantages of wider availability and shorter imaging times. However, contrast-enhanced MR angiography is more suitable in medically stable patients, does not involve nephrotoxic contrast agent or ionizing radiation, and offers greater ease and speed of postprocessing. In clinical practice, contrast-enhanced MR angiography can provide high-quality imaging data suitable for 3D reconstructions. It also has excellent spatial and contrast resolution and allows studies to be performed in multiple vascular phases, making it valuable for the diagnosis and classification of aortic dissection and in providing information that is helpful for treatment planning. Three-dimensional contrast-enhanced MR angiography with postprocessing is a fast, accurate, and noninvasive technique that may prove to be the optimal imaging modality in medically stable patients with aortic dissection.
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Affiliation(s)
- Qi Liu
- Department of Radiology, Changhai Hospital/2nd Military Med University, Shanghai, Shanghai, China.
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Dashti R, Hernesniemi J, Niemelä M, Rinne J, Porras M, Lehecka M, Shen H, Albayrak BS, Lehto H, Koroknay-Pál P, de Oliveira RS, Perra G, Ronkainen A, Koivisto T, Jääskeläinen JE. Microneurosurgical management of middle cerebral artery bifurcation aneurysms. ACTA ACUST UNITED AC 2007; 67:441-56. [PMID: 17445599 DOI: 10.1016/j.surneu.2006.11.056] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2006] [Accepted: 11/28/2006] [Indexed: 11/25/2022]
Abstract
BACKGROUND Of the MCA aneurysms, those located at the main bifurcation of the MCA (MbifA) are by far the most frequent. The purpose of this article is to review the practical anatomy, preoperative planning, and avoidance of complications in the microsurgical dissection and clipping of MbifAs. METHODS This review, and the whole series on intracranial aneurysms, is mainly based on the personal microneurosurgical experience of the senior author (JH) in 2 Finnish centers (Helsinki and Kuopio), which serve without patient selection the catchment area in southern and eastern Finland. RESULTS These 2 centers have treated more than 10,000 patients with intracranial aneurysm's since 1951. In the Kuopio Cerebral Aneurysm Data Base of 3005 patients with 4253 aneurysms, MbifAs formed 30% of all ruptured aneurysms, 36% of all unruptured aneurysms, 35% of all giant aneurysms, and 89% of all MCA aneurysms. Importantly, in 45%, rupture of MbifA caused an ICH. CONCLUSIONS Middle cerebral artery bifurcation aneurysms are often broad necked and may involve one or both branches of the bifurcation (M2s). The anatomical and hemodynamic features of MbifAs make them usually more favorable for microneurosurgical treatment. In population-based services, MbifAs are frequent targets of elective surgery (unruptured), acute surgery (ruptured), and emergency surgery (large ICH), even advanced approaches (giant). The challenge is to clip the neck adequately, without neck remnants, while preserving the bifurcational flow.
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Affiliation(s)
- Reza Dashti
- Department of Neurosurgery, Helsinki University Central Hospital, 00260 Helsinki, Finland
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Rodallec MH, Krainik A, Feydy A, Hélias A, Colombani JM, Jullès MC, Marteau V, Zins M. Cerebral venous thrombosis and multidetector CT angiography: tips and tricks. Radiographics 2007; 26 Suppl 1:S5-18; discussion S42-3. [PMID: 17050519 DOI: 10.1148/rg.26si065505] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Because of the great diversity of clinical features, its unforeseeable evolution, and a small proportion of cases that will worsen in the acute phase, cerebral venous thrombosis must be diagnosed as early as possible so that specific treatment can be started, typically transcatheter thrombolysis or systemic anticoagulation. Unenhanced computed tomography (CT) is usually the first imaging study performed on an emergency basis. Unenhanced CT allows detection of ischemic changes related to venous insufficiency and sometimes demonstrates a hyperattenuating thrombosed dural sinus or vein. Helical multidetector CT venography with bolus power injection of contrast material and combined use of two-dimensional and three-dimensional reformations (maximum intensity projection, integral display, and volume rendering) provides exquisite anatomic detail of the deep and superficial intracranial venous system and can demonstrate filling defects. However, common variants of the sinovenous system should not be mistaken for sinus thrombosis. A comprehensive diagnostic approach facilitates imaging of cerebral venous thrombosis with multidetector CT.
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Affiliation(s)
- Mathieu H Rodallec
- Department of Radiology, Fondation Hôpital Saint-Joseph, 185 rue Raymond Losserand, 75674 Paris cedex 14, France.
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Studio del parenchima cerebrale e dei vasi cervicoencefalici: nuove tecniche di RM e TC. Neurologia 2007. [DOI: 10.1016/s1634-7072(07)70548-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Helland CA, Kråkenes J, Moen G, Wester K. A POPULATION-BASED STUDY OF NEUROSURGICAL AND ENDOVASCULAR TREATMENT OF RUPTURED, INTRACRANIAL ANEURYSMS IN A SMALL NEUROSURGICAL UNIT. Neurosurgery 2006; 59:1168-75; discussion 1175-6. [PMID: 17277679 DOI: 10.1227/01.neu.0000245627.93215.bf] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
OBJECTIVE
Since the introduction of endovascular embolization, the optimal treatment of ruptured aneurysms has been debated. Much of this debate has been based on results from large neurovascular centers and may not be applicable to small neurosurgical centers with low annual aneurysm loads. We think that the results of small centers, such as ours, may also be of some interest.
METHODS
This study included 286 patients treated endovascularly or operated on by the senior investigator (KW) before November 2004. They all had an angiographically verified aneurysm as the source of bleeding in the subarachnoid hemorrhage. Variables related to presentation, radiological findings, treatment, and outcome were recorded.
RESULTS
A significantly higher proportion (66.3%) of the endovascular patients had complete or near-complete recovery (Glasgow Outcome Scale 5) compared with the surgically treated patients (47.8%). When clinical outcomes were dichotomized into favorable (Glasgow Outcome Scale 4–5) and unfavorable (Glasgow Outcome Scale 1–3), no difference was found between the two treatment groups. Treatment-related mortality or morbidity was equal. Significantly more patients were converted from endovascular to surgical treatment than vice versa. No surgically treated patients rebled, whereas four endovascular patients rebled from their previously treated aneurysm.
CONCLUSION
At present in our hospital, the endovascular modality seems to yield a better clinical outcome than surgery and has become our treatment of choice. With increasing use and further refinement of the endovascular techniques, the difference in outcomes between the treatment modalities will probably change even further in favor of the endovascular technique.
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Affiliation(s)
- Christian A Helland
- Department of Surgical Sciences, Section for Neurosurgery, University of Bergen, Bergen, Norway
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