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Gozgec E, Ogul H, Durmus H. Evaluation of anterior and middle cranial fossa intraosseous arachnoid granulations with 3D T2-SPACE sequence. Acta Neurol Belg 2023; 123:1861-1868. [PMID: 36183280 DOI: 10.1007/s13760-022-02097-7] [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: 04/11/2022] [Accepted: 09/12/2022] [Indexed: 11/01/2022]
Abstract
OBJECTIVES Arachnoid granulations (AG) can be located anywhere outside the dural sinuses. Their presence is thought to be associated with idiopathic intracranial hypertension (IIH) and cerebrospinal fluid (CSF) leaks. It was aimed to evaluate the intraosseous AGs located in the middle and anterior cranial fosses in detail with three-dimensional T2-SPACE (Sampling Perfection with Application optimized Contrasts using different flip angle Evolution-Siemens) imaging and to investigate their clinical significance. MATERIALS AND METHODS Sixty-five intraosseous AG of 46 patients were included in this retrospective study. The highest diameter, bone indentation degree (in the inner tabula, diploe distance, reaching and exceeding the outer tabula), content (CSF/+parenchyma) of each AG were evaluated by 2 experienced radiologists. In addition, the presence of other MRI findings supporting IIH was examined. RESULTS Additional signs of IIH were detected in 25 patients, and they were statistically significantly more common in the middle cranial fossa. Parenchymal herniation (in four patients) was more common in the young population. CONCLUSIONS Intraosseous AGs can be evaluated in detail with T2-SPACE imaging. Determining intraosseous AG is very important both as an indicator of IIH and in terms of its content. T2-SPACE imaging is superior to CT and conventional sequences in this regard.
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Wysiadecki G, Tubbs RS, Iwanaga J, Radek M, Walocha J, Brzeziński P, Kobos J, Polguj M. Microanatomical study of arachnoid granulations and meningeal architecture around Meckel's cave. Neurosurg Rev 2023; 46:50. [PMID: 36754877 PMCID: PMC9908694 DOI: 10.1007/s10143-023-01954-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 12/23/2022] [Accepted: 01/23/2023] [Indexed: 02/10/2023]
Abstract
Although the microanatomy of Meckel's cave (MC) has been well studied, there are still controversies regarding the meningeal architecture of the space. Moreover, there are only general mentions of the arachnoid granulations near MC in just a few sources. This study is aimed at determining the frequency, location, and anatomical variability of the main clusters of arachnoid granulations around MC. The dissection involved 26 isolated specimens of MC fixed in formalin (neutral buffered, 10%). This number included five freshly harvested specimens examined histologically. Additional paraffin block with MC horizontal section was taken from our neuroanatomical collection. Carefully selected anatomical and histological techniques were applied to assess the complex relationships between the arachnoid granulations and adjacent structures. Arachnoid granulations were found around MC in all specimens with different anatomical variations. The main clusters of arachnoid granulations were close to the trigeminal ganglion and its divisions. The dorsolateral wall of MC was a thick layer formed by interweaving bundles of collagen fibers arranged in various directions. The entire MC was surrounded by a dural sleeve (envelope). This sleeve separated MC from the lateral sellar compartment. At its anterior (rostral) end, it formed a cribriform area pierced by individual fascicles of the trigeminal nerve's primary divisions. The connective tissue forming the sleeve was not only continuous with the epineurium but also shifted to the perineuria surrounding individual nerve fascicles. The meningeal architecture around MC has a complex and multilayer arrangement with a collagenous sleeve closely related to the trigeminal ganglion. Arachnoid granulations are typically found around MC.
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Affiliation(s)
- Grzegorz Wysiadecki
- Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, Ul. Żeligowskiego 7/9, 90-752, Lodz, Poland.
| | - R Shane Tubbs
- Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA
- Department of Neurology, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA
- Department of Anatomical Sciences, St. George's University, St. George's, Grenada
- Department of Structural & Cellular Biology, Tulane University School of Medicine, New Orleans, LA, USA
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, USA
- Department of Neurosurgery and Ochsner Neuroscience Institute, Ochsner Health System, New Orleans, LA, USA
- University of Queensland, Brisbane, Australia
| | - Joe Iwanaga
- Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA
- Department of Neurology, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA
| | - Maciej Radek
- Department of Neurosurgery, Spine and Peripheral Nerve Surgery, Medical University of Lodz, University Hospital WAM-CSW, Lodz, Poland
| | - Jerzy Walocha
- Department of Anatomy, Jagiellonian University Medical College, Cracow, Poland
| | - Piotr Brzeziński
- Department of Histology and Embryology, Chair of Anatomy and Histology, Medical University of Lodz, Lodz, Poland
| | - Józef Kobos
- Department of Histology and Embryology, Chair of Anatomy and Histology, Medical University of Lodz, Lodz, Poland
| | - Michał Polguj
- Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, Ul. Żeligowskiego 7/9, 90-752, Lodz, Poland
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Yesilyurt M, Gozgec E, Ogul H, Kantarci M. A large central occipital emissary foramen mimicking giant arachnoid granulation on CT images. Neurochirurgie 2020; 66:417-418. [PMID: 32623057 DOI: 10.1016/j.neuchi.2020.04.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 02/29/2020] [Accepted: 04/13/2020] [Indexed: 11/19/2022]
Affiliation(s)
- M Yesilyurt
- Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey
| | - E Gozgec
- Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey
| | - H Ogul
- Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey.
| | - M Kantarci
- Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey
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Benson JC, Lane J, Geske JR, Gompel JV, Krecke KN. Prevalence of Asymptomatic Middle Cranial Fossa Floor Pits and Encephaloceles on MR Imaging. AJNR Am J Neuroradiol 2019; 40:2090-2093. [PMID: 31780461 DOI: 10.3174/ajnr.a6311] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 09/27/2019] [Indexed: 01/17/2023]
Abstract
BACKGROUND AND PURPOSE Temporal lobe encephaloceles are increasingly identified and treated as epileptogenic foci. However, there is relatively scant research on the prevalence of asymptomatic encephaloceles. This study set out to describe the frequency of incidental temporal lobe encephaloceles and middle cranial fossa pits. MATERIALS AND METHODS A retrospective review was completed of high-resolution (≤0.5-mm section thickness) axial T2WI for internal auditory canal protocol imaging. The presence and laterality of middle cranial fossa pits (small bony defects containing CSF) and encephaloceles (brain parenchyma protrusion through osseous defects with or without bony remodeling) were recorded. Electronic medical records of patients with encephaloceles were searched for a history of seizure. RESULTS A total of 203 patients were included in the final cohort; 106 (52.2%) women. Forty-five (22.2%) patients had middle cranial fossa pits: 14 (31.1%) unilateral on the right, 17 (37.8%) unilateral on the left, and 14 (31.1%) bilateral. Ten (5.0%) patients had ≥1 encephalocele, none of whom had a documented history of seizure in the electronic medical record. No significant difference was noted in the frequency of pits or encephaloceles based on sex (P = .332 and P = .383, respectively) or age (P = .497 and P = .914, respectively). CONCLUSIONS Incidental middle cranial fossa pits are common findings, and their prevalence is not related to age or sex. Temporal lobe encephaloceles, though rarer, also exist occasionally among asymptomatic patients. Such findings have diagnostic implications for encephaloceles identified during imaging work-up for epilepsy.
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Affiliation(s)
- J C Benson
- From the Department of Neuroradiology (J.C.B., J.L., K.N.K.)
| | - J Lane
- From the Department of Neuroradiology (J.C.B., J.L., K.N.K.)
| | - J R Geske
- Division of Biomedical Statistics and Informatics (J.R.G.)
| | - J V Gompel
- Department of Neurosurgery (J.V.G.), Mayo Clinic, Rochester, Minnesota
| | - K N Krecke
- From the Department of Neuroradiology (J.C.B., J.L., K.N.K.)
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Yancey KL, Manzoor NF, Yawn RJ, O'Malley M, Rivas A, Bennett ML, Haynes DS. Cerebrospinal Fluid Leaks of the Posterior Fossa: Patient Characteristics and Imaging Features. J Neurol Surg B Skull Base 2019; 82:345-350. [PMID: 34026411 DOI: 10.1055/s-0039-1697976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Accepted: 08/17/2019] [Indexed: 10/25/2022] Open
Abstract
Objective The main purpose of this article is to investigate the prevalence and features of posterior fossa defects (PFD) in spontaneous cerebrospinal fluid leaks (sCSFL). Design This is a retrospective case series. Setting Tertiary skull base center. Participants Consecutive adults undergoing lateral skull base repair of sCSFL between 2003 and 2018. Main Outcome Measures The following data were collected: demographics, comorbidities, radiology and intraoperative findings, and surgical outcomes including complications and need for revision surgery or shunt placement. Patients with incomplete data or leaks following skull base surgery, trauma, or chronic ear disease were excluded. Results Seventy-one patients (74% female, mean age 56.39 ± 11.50 years) underwent repair of spontaneous lateral skull base leaks. Eight ears (7 patients, 11.1%) had leaks involving the posterior fossa plate in addition to defects of the tegmen mastoideum (50%), tegmen tympani (25%), or both (25%). Patients with PFDs more often had bilateral tegmen thinning on imaging (75%, odds ratio [OR]: 10.71, 95% confidence interval [CI]: 2.20-54.35, p = 0.005) and symptomatic bilateral leaks (OR: 9.67, 95% CI: 2.22-40.17, p = 0.01. All PFD patients had arachnoid granulations adjacent to ipsilateral mastoid cell opacification. However, this finding was often subtle and rarely included on the radiology report. There was no significant difference in body mass index, age, presenting complaints, or operative success between the PFD and isolated tegmen defect sCSFL cohorts. Conclusion The posterior fossa is an uncommon location for sCSFL. Careful review of preoperative imaging is often suggestive and can inform surgical approach. PFD patients are similar to those with isolated tegmen-based defects in presentation, comorbidities, and outcomes.
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Affiliation(s)
- Kristen L Yancey
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - Nauman F Manzoor
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - Robert J Yawn
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - Matthew O'Malley
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - Alejandro Rivas
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - Marc L Bennett
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
| | - David S Haynes
- Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University, Nashville, Tennessee, United States
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Umeh R, Oskouian RJ, Loukas M, Tubbs RS. Giant Arachnoid Granulation Associated with Anomalous Draining Vein: A Case Report. Cureus 2017; 9:e1065. [PMID: 28409066 PMCID: PMC5375954 DOI: 10.7759/cureus.1065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Giant arachnoid granulations (AG) can mimic intracranial lesions. Knowledge of these structures can help avoid misdiagnosis when interpreting imaging. Here, we report a child who presented with a mass within the superior sagittal sinus and an anomalous draining vein. Herein, the diagnosis of a giant AG was made. Clinicians who view or interpret imaging of the head should be aware of these anatomical variants and though when very large, apparently, do not necessarily result in pathology. Based on our case report, giant AG might also demonstrate anomalous draining veins.
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Affiliation(s)
- Randle Umeh
- Department of Anatomical Sciences, St. George's University School of Medicine, Grenada, West Indies
| | | | - Marios Loukas
- Department of Anatomical Sciences, St. George's University School of Medicine, Grenada, West Indies
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Miyajima M, Arai H. Evaluation of the Production and Absorption of Cerebrospinal Fluid. Neurol Med Chir (Tokyo) 2015; 55:647-56. [PMID: 26226980 PMCID: PMC4628155 DOI: 10.2176/nmc.ra.2015-0003] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The traditional hypothesis of cerebrospinal fluid (CSF) hydrodynamics presumes that CSF is primarily produced in the choroid plexus (CP), then flows from the ventricles into the subarachnoid spaces, and mainly reabsorbed in the arachnoid granulations. This hypothesis is necessary to reconsider in view of recent research and clinical observations. This literature review presents numerous evidence for a new hypothesis of CSF hydrodynamics-(1) A significantly strong relationship exists between the CSF and interstitial fluid (IF), (2) CSF and IF are mainly produced and absorbed in the parenchymal capillaries of the brain and spinal cord. A considerable amount of CSF and IF are also absorbed by the lymphatic system, and (3) CSF movement is not unidirectional flow. It is only local mixing and diffusion.
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Affiliation(s)
- Masakazu Miyajima
- Department of Neurosurgery, Juntendo University Graduate School of Medicine
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Tsutsumi S, Ogino I, Miyajima M, Ito M, Arai H, Yasumoto Y. Cerebrospinal fluid drainage through the diploic and spinal epidural veins. J Anat 2015; 227:297-301. [PMID: 26184099 DOI: 10.1111/joa.12349] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2015] [Indexed: 01/13/2023] Open
Abstract
The aim of this study was to quantitatively evaluate the function of the cranial diploic and spinal epidural veins as cerebrospinal fluid (CSF) drainage pathways by measuring lipocalin-type prostaglandin D synthase (PGDS) and cystatin C (CysC) dissolved in the blood of these veins. This was a prospective study involving 51 consecutive patients, 31 males and 20 females, who underwent 41 cranial and 10 spinal surgeries. Intraoperatively, peripheral venous blood and diploic venous blood, or peripheral venous blood and spinal epidural venous blood samples were simultaneously collected and immediately centrifuged. For all samples, dissolved albumin (for reference), PGDS and CysC were measured using an enzyme-linked immunosorbent assay. The diploic vein/peripheral vein ratios in five cranial locations and epidural vein/peripheral vein ratios were calculated and statistically evaluated for the three biomarkers. For PGDS, the diploic vein/peripheral vein ratio was significantly increased in the frontal (P = 0.011), temporal (P = 0.028), parietal (P = 0.046) and skull base (P = 0.039), while it did not reach statistical significance for CysC. For patients older than 45 years, the diploic vein/peripheral vein ratio for PGDS was significantly decreased in the frontal region (P = 0.028), and the epidural vein/peripheral vein ratio for CysC was significantly decreased (P = 0.014). These results show that the diploic veins constitute CSF drainage pathways with heterogeneous functional intensity at different cranial locations. Compared with the diploic veins, spinal epidural veins seem to drain less CSF. The cranial diploic and spinal epidural veins may jointly function as an alternative, age-related trans-dural CSF drainage system.
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Affiliation(s)
- Satoshi Tsutsumi
- Department of Neurological Surgery, Juntendo University Urayasu Hospital, Urayasu, Chiba, Japan
| | - Ikuko Ogino
- Department of Neurological Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Masakazu Miyajima
- Department of Neurological Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Masanori Ito
- Department of Neurological Surgery, Juntendo University Urayasu Hospital, Urayasu, Chiba, Japan
| | - Hajime Arai
- Department of Neurological Surgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Yukimasa Yasumoto
- Department of Neurological Surgery, Juntendo University Urayasu Hospital, Urayasu, Chiba, Japan
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Tsutsumi S, Ogino I, Miyajima M, Nakamura M, Yasumoto Y, Arai H, Ito M. Cranial arachnoid protrusions and contiguous diploic veins in CSF drainage. AJNR Am J Neuroradiol 2014; 35:1735-9. [PMID: 24948506 DOI: 10.3174/ajnr.a4007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND AND PURPOSE Studies have suggested that arachnoid villi or granulations found in the walls of the cranial dural sinuses, olfactory mucosa, and cranial nerve sheaths function as outlets for intracranial CSF. However, their role as CSF outlets has not yet been verified. Here we show that arachnoid protrusions and contiguous diploic veins provide an alternative drainage route for intracranial CSF. MATERIALS AND METHODS Four hundred patients with intact skull, dura mater, and dural sinuses underwent MR imaging to explore arachnoids protruding into the skull and diploic veins. Patients with symptoms of increased intracranial pressure or intracranial hypotension were excluded. For 15 patients undergoing craniotomy, both peripheral and diploic venous blood was collected. Albumin and the CSF-specific biomarkers were measured by enzyme-linked immunosorbent assay. RESULTS With MR imaging, arachnoid protrusions into the skull and contiguous diploic veins were consistently identified throughout the cranium with their characteristic appearance depending on the cranial region. In addition, elevated amounts of prostaglandin D synthase and cystatin C were confirmed in diploic veins compared with peripheral venous blood. CONCLUSIONS Diploic veins are distributed ubiquitously throughout the cranium. A portion of the intracranial CSF may be drained through arachnoid protrusions and contiguous diploic veins.
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Affiliation(s)
- S Tsutsumi
- From the Department of Neurological Surgery (S.T., Y.Y., M.I.), Juntendo University Urayasu Hospital, Chiba, Japan
| | - I Ogino
- Department of Neurological Surgery (I.O., M.M., H.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Miyajima
- Department of Neurological Surgery (I.O., M.M., H.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Nakamura
- Division of Radiological Technology (M.N.), Medical Satellite Yaesu Clinic, Tokyo, Japan
| | - Y Yasumoto
- From the Department of Neurological Surgery (S.T., Y.Y., M.I.), Juntendo University Urayasu Hospital, Chiba, Japan
| | - H Arai
- Department of Neurological Surgery (I.O., M.M., H.A.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Ito
- From the Department of Neurological Surgery (S.T., Y.Y., M.I.), Juntendo University Urayasu Hospital, Chiba, Japan
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Abstract
Arachnoid granulation is often found incidentally in the dural sinuses and skull. It may also enlarge the dural sinus or inner table of the skull. We report a 46-year-old woman who presented with occipital headaches and arachnoid granulations in both transverse sinuses and torcular herophili. Neurological examination was normal. Fundoscopic examination, visual fields and acuity were normal. The headache resolved with medical treatment. No intervention for these lesions was planned. The patient was followed up with magnetic resonance imaging studies.
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The intracranial arachnoid mater : a comprehensive review of its history, anatomy, imaging, and pathology. Childs Nerv Syst 2013; 29:17-33. [PMID: 22961357 DOI: 10.1007/s00381-012-1910-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 08/27/2012] [Indexed: 10/27/2022]
Abstract
INTRODUCTION The arachnoid mater is a delicate and avascular layer that lies in direct contact with the dura and is separated from the pia mater by the cerebrospinal fluid-filled subarachnoid space. The subarachnoid space is divided into cisterns named according to surrounding brain structures. METHODS The medical literature on this meningeal layer was reviewed in regard to historical aspects, etymology, embryology, histology, and anatomy with special emphasis on the arachnoid cisterns. Cerebrospinal fluid dynamics are discussed along with a section devoted to arachnoid cysts. CONCLUSION Knowledge on the arachnoid mater and cerebrospinal fluid dynamics has evolved over time and is of great significance to the neurosurgeon in clinical practice.
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Tubbs RS, Loukas M. Arachnoid granulations of the middle cranial fossa. Surg Radiol Anat 2010; 33:289. [PMID: 21140145 DOI: 10.1007/s00276-010-0758-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Accepted: 11/26/2010] [Indexed: 11/25/2022]
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