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Lefevre E, Fawaz R, Premat K, Lenck S, Shotar E, Degos V, Kalamarides M, Boch AL, Carpentier A, Clarençon F, Nouet A. Delayed traumatic intracranial aneurysms: literature review and case series. Neurosurg Rev 2024; 47:355. [PMID: 39060452 DOI: 10.1007/s10143-024-02586-8] [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: 03/05/2024] [Revised: 05/16/2024] [Accepted: 07/08/2024] [Indexed: 07/28/2024]
Abstract
Traumatic intracranial aneurysm (TICA) is a rare and aggressive pathology that requires prompt treatment. Nevertheless, early vascular imaging following head trauma may yield falsely negative results, underscoring the importance of subsequent imaging within the first week to detect delayed TICAs. This study aims to report our experience with delayed TICAs and highlight the clinical importance of repeated angiographic screening for delayed TICAs. In this retrospective analysis, we evaluated patients managed for a TICA at a tertiary care teaching institution over the last decade. Additionally, we conducted a systematic review of the literature, following the PRISMA guidelines, on previously reported TICAs, focusing on the time lag between the injury and diagnosis. Twelve delayed TICAs were diagnosed in 9 patients. The median time interval from injury to diagnosis was 2 days (IQR: 1-22 days), and from diagnosis to treatment was 2 days (IQR: 0-9 days). The average duration of radiological follow-up was 28 ± 38 months. At the final follow-up, four patients exhibited favorable neurological outcomes, while the remainder had adverse outcomes. The mortality rate was 22%. Literature reviews identified 112 patients with 114 TICAs, showcasing a median diagnostic delay post-injury of 15 days (IQR: 6-44 days), with 73% diagnosed beyond the first week post-injury. The median time until aneurysm rupture was 9 days (IQR: 3-24 days). Our findings demonstrate acceptable outcomes following TICA treatment and highlight the vital role of repeated vascular imaging after an initial negative computed tomography or digital subtraction angiography in excluding delayed TICAs.
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Affiliation(s)
- Etienne Lefevre
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France.
- Sorbonne University, Paris, France.
| | - Rayan Fawaz
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France
| | - Kevin Premat
- Sorbonne University, Paris, France
- Department of Neuroradiology, Pitié-Salpêtrière Hospital, Paris, France
| | - Stéphanie Lenck
- Sorbonne University, Paris, France
- Department of Neuroradiology, Pitié-Salpêtrière Hospital, Paris, France
| | - Eimad Shotar
- Department of Neuroradiology, Pitié-Salpêtrière Hospital, Paris, France
- Sorbonne Université, INSERM, Institut de la vision, Paris, France
| | - Vincent Degos
- Sorbonne University, Paris, France
- Department of Anesthesia and Intensive Care, Sorbonne University, Pitié- Salpêtrière Hospital, APHP, DMU DREAM, GRC 29, Paris, France
| | - Michel Kalamarides
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France
- Sorbonne University, Paris, France
| | - Anne-Laure Boch
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France
- Sorbonne University, Paris, France
| | - Alexandre Carpentier
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France
- Sorbonne University, Paris, France
| | - Frédéric Clarençon
- Sorbonne University, Paris, France
- Department of Neuroradiology, Pitié-Salpêtrière Hospital, Paris, France
| | - Aurélien Nouet
- Department of Neurosurgery, Pitié-Salpêtrière University Hospital, 47-83 Boulevard de l'hôpital, Paris, 75013, France
- Sorbonne University, Paris, France
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2
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Behar M, Peck KK, Yildirim O, Tisnado J, Saha A, Arevalo-Perez J, Lis E, Yamada Y, Holodny AI, Karimi S. T1-Weighted, Dynamic Contrast-Enhanced MR Perfusion Imaging Can Differentiate between Treatment Success and Failure in Spine Metastases Undergoing Radiation Therapy. AJNR Am J Neuroradiol 2023; 44:1451-1457. [PMID: 38049990 PMCID: PMC10714859 DOI: 10.3174/ajnr.a8057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Accepted: 10/05/2023] [Indexed: 12/06/2023]
Abstract
BACKGROUND AND PURPOSE Current imaging techniques have difficulty differentiating treatment success and failure in spinal metastases undergoing radiation therapy. This study investigated the correlation between changes in dynamic contrast-enhanced MR imaging perfusion parameters and clinical outcomes following radiation therapy for spinal metastases. We hypothesized that perfusion parameters will outperform traditional size measurements in discriminating treatment success and failure. MATERIALS AND METHODS This retrospective study included 49 patients (mean age, 63 [SD, 13] years; 29 men) with metastatic lesions treated with radiation therapy who underwent dynamic contrast-enhanced MR imaging. The median time between radiation therapy and follow-up dynamic contrast-enhanced MR imaging was 62 days. We divided patients into 2 groups: clinical success (n = 38) and failure (n = 11). Failure was defined as PET recurrence (n = 5), biopsy-proved (n = 1) recurrence, or an increase in tumor size (n = 7), while their absence defined clinical success. A Mann-Whitney U test was performed to assess differences between groups. RESULTS The reduction in plasma volume was greater in the success group than in the failure group (-57.3% versus +88.2%, respectively; P < .001). When we assessed the success of treatment, the sensitivity of plasma volume was 91% (10 of 11; 95% CI, 82%-97%) and the specificity was 87% (33 of 38; 95% CI, 73%-94%). The sensitivity of size measurements was 82% (9 of 11; 95% CI, 67%-90%) and the specificity was 47% (18 of 38; 95% CI, 37%-67%). CONCLUSIONS The specificity of plasma volume was higher than that of conventional size measurements, suggesting that dynamic contrast-enhanced MR imaging is a powerful tool to discriminate between treatment success and failure.
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Affiliation(s)
- Mark Behar
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Kyung K Peck
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
- Department of Medical Physics (K.K.P.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Onur Yildirim
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Jamie Tisnado
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Atin Saha
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Julio Arevalo-Perez
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Eric Lis
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Yoshiya Yamada
- Department of Radiation Oncology (Y.Y.), Memorial Sloan Kettering Cancer Center, New York, New York
| | - Andrei I Holodny
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
- Department of Radiology (A.I.H.), Weill Medical College of Cornell University, New York, New York
- Department of Neuroscience (A.I.H.), Weill-Cornell Graduate School of the Medical Sciences, New York, New York
| | - Sasan Karimi
- From the Department of Radiology (M.B., K.K.P., O.Y., J.T., A.S., J.A.-P., E.L., A.I.H., S.K.), Memorial Sloan Kettering Cancer Center, New York, New York
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3
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Theocharidou A, Spanou A, Alexandratou M, Michas V, Lamprou V, Psoma E, Finitsis S. An off-label use of flow-diverter stent as a successful treatment of a postoperative middle cerebral artery pseudoaneurysm. Radiol Case Rep 2023; 18:2219-2223. [PMID: 37123043 PMCID: PMC10139864 DOI: 10.1016/j.radcr.2023.03.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/24/2023] [Accepted: 03/07/2023] [Indexed: 05/02/2023] Open
Abstract
A pseudoaneurysm or false aneurysm is the result of the disruption of the vessel wall and the formation of a hematoma in communication with the vascular lumen, restrained by perivascular connective tissue. Intracranial pseudoaneurysms represent a rare entity mainly because of trauma, iatrogenic causes, infectious disease, radiation exposure, connective tissue disease and sometimes spontaneous occurrence. We present a 35-year-old female patient with a history of multiple low-grade glioma debulking surgeries. During the last procedure, laceration of the left middle cerebral artery (MCA) occurred with diffuse subarachnoid hemorrhage. Imaging studies showed the formation of a pseudoaneurysm of the left MCA which was successfully treated with the implantation of a flow diverter across the lesion neck and excellent mid- to long- term results. Flow diverter implantation may be a promising technique for the therapeutic management of cerebral pseudoaneurysms.
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4
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Tateshima S, Saber H, Colby GP, Enzmann D, Duckwiler G. Republished: Robotic assistant spinal angiography: a case report and technical considerations. J Neurointerv Surg 2023; 15:e7. [PMID: 35177517 DOI: 10.1136/neurintsurg-2020-017122.rep] [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: 12/03/2020] [Revised: 01/27/2021] [Accepted: 01/27/2021] [Indexed: 11/03/2022]
Abstract
Robotic-assisted technology has shown to be promising in coronary and peripheral vascular interventions. Early case reports have also demonstrated its efficacy in neuro-interventions. However, there is no prior report demonstrating use of the robotic-assisted platform for spinal angiography. We report the feasibility of the robotic-assisted thoracic and lumbar spinal angiography.
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Affiliation(s)
- Satoshi Tateshima
- Interventional Neuroradiology, Radiological Sciences, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
| | - Hamidreza Saber
- Interventional Neuroradiology, Radiological Sciences, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
| | - Geoffrey P Colby
- Neurosurgery & Interventional Neuroradiology, Radiological Sciences, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
| | - Dieter Enzmann
- Radiological Sciences, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
| | - Gary Duckwiler
- Interventional Neuroradiology, Radiological Sciences, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
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5
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Budohoski KP, Thakrar R, Voronovich Z, Rennert RC, Kilburg C, Grandhi R, Couldwell WT, Brockmeyer DL, Taussky P. Initial experience with Pipeline embolization of intracranial pseudoaneurysms in pediatric patients. J Neurosurg Pediatr 2022; 30:465-473. [PMID: 36057120 DOI: 10.3171/2022.7.peds22195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/22/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Flow-diverting devices have been used successfully for the treatment of complex intracranial vascular injuries in adults, but the role of these devices in treating iatrogenic and traumatic intracranial vascular injuries in children remains unclear. The authors present their experience using the Pipeline embolization device (PED) for treating intracranial pseudoaneurysms in children. METHODS This single-center retrospective cohort study included pediatric patients with traumatic and iatrogenic injuries to the intracranial vasculature that were treated with the PED between 2015 and 2021. Demographic data, indications for treatment, the number and sizes of PEDs used, follow-up imaging, and clinical outcomes were analyzed. RESULTS Six patients with a median age of 12 years (range 7-16 years) underwent PED placement to treat intracranial pseudoaneurysms. There were 3 patients with hemorrhagic presentation, 2 with ischemia, and 1 in whom a growing pseudoaneurysm was found on angiography. Injured vessels included the anterior cerebral artery (n = 2), the supraclinoid internal carotid artery (ICA, n = 2), the cavernous ICA (n = 1), and the distal cervical ICA (n = 1). All 6 pseudoaneurysms were successfully treated with PED deployment. One patient required re-treatment with a second PED within a week because of concern for a growing pseudoaneurysm. One patient experienced parent vessel occlusion without neurological sequelae. CONCLUSIONS Use of the PED is feasible for the management of iatrogenic and traumatic pseudoaneurysms of the intracranial vasculature in children, even in the setting of hemorrhagic presentation.
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Affiliation(s)
- Karol P Budohoski
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
| | - Raj Thakrar
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
| | - Zoya Voronovich
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
| | - Robert C Rennert
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
| | - Craig Kilburg
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
- 2Department of Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah
| | - Ramesh Grandhi
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
- 2Department of Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah
| | - William T Couldwell
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
- 2Department of Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah
| | - Douglas L Brockmeyer
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
- 2Department of Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah
| | - Philipp Taussky
- 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City; and
- 2Department of Neurosurgery, Primary Children's Hospital, University of Utah, Salt Lake City, Utah
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6
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Lu D, Ma T, Zhu G, Zhang T, Wang N, Lei H, Sui J, Wang Z, He S, Chen L, Deng J. Willis Covered Stent for Treating Intracranial Pseudoaneurysms of the Internal Carotid Artery: A Multi-Institutional Study. Neuropsychiatr Dis Treat 2022; 18:125-135. [PMID: 35125870 PMCID: PMC8811267 DOI: 10.2147/ndt.s345163] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 01/16/2022] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE This work aimed to retrospectively analyze Willis covered stent (WCS)'s therapeutic efficacy in intracranial pseudoaneurysms (PSAs) of the internal carotid artery (ICA). METHODS Between June 2018 and July 2021, 56 individuals with intracranial PSAs of the ICA treated with WCS in three centers were included to analyze information regarding medical records, operative parameters, imaging findings and follow-up data. RESULTS All WCSs were successfully targeted to the ICA lesions. Total exclusion of PSA was found in 53 cases (94.6%) right upon surgery, and mild endoleak into the aneurysm remained in 3 cases (5.4%). Intraoperative thrombosis occurred in 1 case (1.8%), and tirofiban was utilized for recanalization. Follow-up by angiography showed total aneurysm occlusion in the total number of individuals, including in the 3 above cases with residual endoleak. In-stent stenosis occurred in 7 (12.5%) patients. No stent-related ischemic event was encountered. Predictive factors of late in-stent stenosis following WCS implantation in this patient group were irregular post-operative antiplatelet treatment (p = 0.015) and C4-C5 segment of the ICA (p = 0.043). CONCLUSION WCSs are effective in treating intracranial PSAs of the ICA.
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Affiliation(s)
- Dan Lu
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Tao Ma
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Gemin Zhu
- Department of Neurology, Xi'an Central Hospital, Xi'an, People's Republic of China
| | - Tao Zhang
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, People's Republic of China
| | - Naibing Wang
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Hui Lei
- Department of Neurology, Xi'an Central Hospital, Xi'an, People's Republic of China
| | - Jing Sui
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Zhiguo Wang
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Shiming He
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Lei Chen
- Department of Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, People's Republic of China
| | - Jianping Deng
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, People's Republic of China
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7
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Cancelliere NM, Lynch J, Nicholson P, Dobrocky T, Swaminathan SK, Hendriks EJ, Krings T, Radovanovic I, Drake KE, Turner R, Sungur JM, Pereira VM. Robotic-assisted intracranial aneurysm treatment: 1 year follow-up imaging and clinical outcomes. J Neurointerv Surg 2021; 14:1229-1233. [PMID: 34911735 DOI: 10.1136/neurintsurg-2021-017865] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 10/06/2021] [Indexed: 11/04/2022]
Abstract
BACKGROUND The use of robotics in medicine may enable increased technical accuracy, reduced procedural time and radiation exposure, and remote completion of procedures. We have previously described the first-in-human, robotic-assisted cerebral aneurysm treatment using the CorPath GRX Robotic System. In this report we discuss our early experiences and outcomes using this robotic device for endovascular treatment of intracranial aneurysms using stent-assisted coil embolization and flow diversion. METHODS The patient and disease characteristics, procedural details, and follow-up imaging and clinical outcomes of consecutive patients undergoing robotically-assisted intracranial aneurysm embolization between November 2019 and February 2020 are presented. RESULTS Six patients underwent robotically-assisted embolization of intracranial aneurysms. Four of the patients were treated with a neck-bridging stent (with or without coiling) and two patients were treated with a flow-diverting stent. Two patients were treated in the subacute period of subarachnoid hemorrhage and four patients were treated electively. All of the procedures could be completed robotically and there was no need for unplanned manual intervention. The technical success rate of the procedures was 100%. There was no morbidity or mortality associated with the procedures. One year follow-up imaging showed that four aneurysms were completely obliterated (Raymond-Roy Occlusion Classification (RROC) class I) and the remaining two were occluded with a residual neck (RROC class II). CONCLUSIONS The Corpath GRX Robotic System demonstrated a precise control over the microcatheter, wire and stent during aneurysm treatment. Robotic neuro-procedures seem to be safe and effective and demonstrate stable occlusion results in the midterm follow-up.
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Affiliation(s)
- Nicole Mariantonia Cancelliere
- Division of Neurosurgery, Department of Surgery, RADIS Lab, Li Ka-shing Knowledge Institute, St. Michael's hospital, Toronto, Ontario, Canada
| | - Jeremy Lynch
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Patrick Nicholson
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Tomas Dobrocky
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Saravana Kumar Swaminathan
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Eef Jacobus Hendriks
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Timo Krings
- Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, Ontario, Canada.,Division of Neurosurgery, Department of Neurosurgery, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Ivan Radovanovic
- Division of Neurosurgery, Department of Neurosurgery, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Kaitlyn E Drake
- Department of Research and Development, Corindus Vascular Robotics, Waltham, Massachusetts, USA
| | - Raymond Turner
- Department of Research and Development, Corindus Vascular Robotics, Waltham, Massachusetts, USA.,Department of Neurosurgery, Prisma Health Upstate, Greenville, South Carolina, USA
| | - John-Michael Sungur
- Department of Research and Development, Corindus Vascular Robotics, Waltham, Massachusetts, USA
| | - Vitor M Pereira
- Division of Neurosurgery, Departments of Surgery & Medical Imaging, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada
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8
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Liu A, Rincon-Torroella J, Bender MT, McDougall CG, Tufaro AP, London NR, Coon AL, Reh DD, Gallia GL. Combined Pipeline Embolization Device with Endoscopic Endonasal Fascia Lata/Muscle Graft Repair as a Salvage Technique for Treatment of Iatrogenic Carotid Artery Pseudoaneurysm. J Neurol Surg Rep 2021; 82:e43-e48. [PMID: 34877246 PMCID: PMC8635816 DOI: 10.1055/s-0041-1735284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 01/14/2021] [Indexed: 11/16/2022] Open
Abstract
The incidence of internal carotid artery (ICA) injury associated with endoscopic endonasal approaches to the pituitary is less than 1%. While parent vessel sacrifice has historically been the choice of treatment, vessel-preserving endovascular techniques have been reported. Although flow diversion offers endoluminal reconstruction, its major limitation is the delay in obtaining complete occlusion. We describe the use of a combined Pipeline embolization device (PED) with endoscopic endonasal repair using a fascia lata/muscle graft to treat an iatrogenic ICA pseudoaneurysm and report long-term radiographic follow-up. Further investigation into the utility of directed endoscopic endonasal repair of iatrogenic pseudoaneurysms initially treated with PED is necessary, especially given the need of post-PED anticoagulation and the rate of permanent neurological deficit after ICA sacrifice.
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Affiliation(s)
- Ann Liu
- Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland, United States
| | | | - Matthew T Bender
- Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland, United States.,Department of Neurosurgery, University of Rochester Medical Center, Rochester, New York, United States
| | - Cameron G McDougall
- Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland, United States
| | - Anthony P Tufaro
- Department of Plastic and Reconstructive Surgery, Johns Hopkins Hospital, Baltimore, Maryland, United States.,Division of Plastic Surgery, Department of Surgery, The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Nyall R London
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Hospital, Baltimore, Maryland, United States
| | - Alexander L Coon
- Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland, United States.,Department of Neurosurgery, Carondelet Neurological Institute, Tucson, Arizona, United States
| | - Douglas D Reh
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Hospital, Baltimore, Maryland, United States.,Department of Otolaryngology-Head and Neck Surgery, Greater Baltimore Medical Center, Baltimore, Maryland, United States
| | - Gary L Gallia
- Department of Neurosurgery, Johns Hopkins Hospital, Baltimore, Maryland, United States.,Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Hospital, Baltimore, Maryland, United States
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9
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Athanasiou S, Aslanidi C, Mamalis V, Markogiannakis G, Tsanis A, Arhontakis E. Endovascular management of spontaneous intracranial pseudoaneurysms in a pediatric patient with Noonan syndrome. A mere coincidence or a possible association with the disorder? Surg Neurol Int 2021; 12:537. [PMID: 34754587 PMCID: PMC8571254 DOI: 10.25259/sni_837_2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/30/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Noonan syndrome (NS) is a rare autosomal-dominant neurodevelopmental disorder, which typically develops abnormalities of the craniofacial development and congenital heart defects. A number of cerebrovascular anomalies have also been occasionally described previously in the setting of NS. The assumption that NS can induce the formation of intracranial pseudoaneurysm (IAP) or the rupture of an already existing abnormality is yet unknown. CASE DESCRIPTION We encountered a rare case of a 9-year-old NS patient with two IAPs presenting with episodes of intracerebral hemorrhage that were successfully managed with endovascular embolization. CONCLUSION This case represents a possible association between NS and the presence of ruptured IAPs.
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Affiliation(s)
- Sofia Athanasiou
- Department of Interventional Radiology, Red Cross Hospital, Athens, Greece
| | - Christina Aslanidi
- Department of Interventional Radiology, Red Cross Hospital, Athens, Greece
| | - Vasileios Mamalis
- Department of Interventional Radiology, Red Cross Hospital, Athens, Greece
| | | | - Antonios Tsanis
- Department of Interventional Radiology, Red Cross Hospital, Athens, Greece
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10
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Iatrogenic Middle Cerebral Artery Ruptured Pseudoaneurysm Successfully Treated With a Pipeline Embolization Device. Ochsner J 2021; 21:190-193. [PMID: 34239381 PMCID: PMC8238105 DOI: 10.31486/toj.19.0122] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background: Endovascular advances have shifted the treatment algorithms for traumatic intracranial pseudoaneurysms (IPs) from vessel sacrifice to reconstruction. The Pipeline embolization device (PED) is a flow-diverting stent that promotes endothelialization across the lesion and reconstitutes the parent vessel lumen. Case Report: A 66-year-old male with a history of a right orbital apex lesion presented for biopsy with ophthalmology. Ophthalmology performed a right lateral orbitotomy complicated by brisk arterial bleeding from a proximal right middle cerebral artery (MCA) pseudoaneurysm. The MCA pseudoaneurysm was treated endovascularly with a PED, resulting in immediate stasis of contrast within the lesion without compilation. Interval follow-up angiograms 6 weeks and 6 months after the procedure showed no evidence of recurrence and a widely patent stent. Conclusion: The PED provided a rapid, minimally invasive, and durable treatment option for an acutely ruptured IP. We illustrate that endovascular management with flow diversion can be effectively used in select cases and provides a way to reconstruct the damaged vessel lumen and obliterate the aneurysm.
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Johnson RM, Young M, Guglielmi GN, Farhat H. Proximal basilar artery hemorrhage after submaximal angioplasty for intracranial atherosclerotic disease presenting as a large vessel occlusion treated with pipeline embolization device. J Cerebrovasc Endovasc Neurosurg 2021; 23:145-151. [PMID: 34134445 PMCID: PMC8256018 DOI: 10.7461/jcen.2021.e2020.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 12/16/2020] [Indexed: 11/23/2022] Open
Abstract
Iatrogenic vessel perforation from endovascular intervention is a devastating complication that commonly is treated with vessel sacrifice. We present a unique case of an iatrogenic proximal basilar artery perforation after submaximal angioplasty in a 67-year-old male presenting with an acute basilar artery occlusion with underlying intracranial atherosclerotic disease. Telescoping flow-diverting stents were then deployed to reconstruct the vessel wall with resulting active hemorrhage resolution. Our case documents a successful deployment of flow-diverting stents with resolution of active hemorrhage after an iatrogenic basilar artery perforation.
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Affiliation(s)
- Ryan M Johnson
- Department of Neurosurgery, Carle BroMenn Medical Center, Normal, IL, USA
| | - Michael Young
- Department of Neurosurgery, Carle BroMenn Medical Center, Normal, IL, USA
| | - Gina N Guglielmi
- Department of Neurosurgery, Carle BroMenn Medical Center, Normal, IL, USA
| | - Hamad Farhat
- Department of Neurosurgery, Advocate Christ Medical Center, Oak Lawn, IL, USA
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12
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Fustero de Miguel D, López López LB, Avedillo Ruidíaz A, Orduna Martínez J, Casado Pellejero J, Moles Herbera JA. Repair of internal carotid artery injury with aneurysm clip during endoscopic endonasal surgery: illustrative case. JOURNAL OF NEUROSURGERY: CASE LESSONS 2021; 1:CASE2098. [PMID: 36045935 PMCID: PMC9394176 DOI: 10.3171/case2098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 11/18/2020] [Indexed: 12/31/2022]
Abstract
BACKGROUNDOne of the most feared and dangerous scenarios that can appear during an endoscopic endonasal surgery (EES) is the iatrogenic injury of the internal carotid artery (ICA). Several methods, along with a variety of outcomes, have been described to deal with this complication. To the authors’ knowledge, this is the first report on the use of a Yasargil-type aneurysm clip to solve an ICA injury, preserving the artery’s patency and having a long-term follow-up. The authors discuss the advantages and disadvantages of other vessel preservation techniques compared with clipping.OBSERVATIONSA visually impaired 56-year-old woman was diagnosed with a giant nonfunctional pituitary tumor that invaded the sphenoidal sinus, anterior and posterior ethmoidal cells, and both cavernous sinuses, with suprasellar extension and optochiasmatic compression. The patient underwent EES, and during the final resection phase her left ICA was injured, with massive hemorrhage.LESSONSICA injury during endoscopic skull base surgery carries high mortality and morbidity; it is essential to maintain carotid flow when possible to avoid short-term and long-term consequences. There are several techniques depicted in the literature to deal with this situation. The authors report the use of a Yasargil mini-clip to deal with the injury for a positive outcome: primary hemostasis, vessel preservation, and no postoperative complications.
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13
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Ghorbani M, Griessenauer CJ, Shojaei H, Wipplinger C, Hejazian E. Endovascular reconstruction of iatrogenic internal carotid artery injury following endonasal surgery: a systematic review. Neurosurg Rev 2020; 44:1797-1804. [PMID: 32860104 DOI: 10.1007/s10143-020-01379-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 07/30/2020] [Accepted: 08/24/2020] [Indexed: 10/23/2022]
Abstract
The objective of this study is to provide an update on endovascular treatments for iatrogenic internal carotid artery (ICA) injuries following endonasal surgery. A systematic review of the literature was performed by using Medline, Cochrane library, and Scopus from 1999 to 2019. We used a combination of the MeSH terms "internal carotid artery," "iatrogenic disease," and "endovascular procedure." Twenty-six articles including 46 patients were identified for in this systematic review. The mean age of the patients was 49 years (CI: ± 4.2). The most common site of ICA injury was in cavernous segment (18 patients; 39%). The most common type of iatrogenic ICA injury was a traumatic pseudoaneurysm documented in 28 patients (60%). Endoluminal reconstruction was performed using covered stents in 28 patients, the Pipeline embolization device (PED) in 13 patients, the Surpass flow diverter device in three, the SILK flow diverter in one, and one case was treated using a combined approach of a covered stent and a PED. Flow diversion and covered stents resulted in a good clinical outcome in 94% and 89% of patients, respectively. This difference did not reach statistical significance (p = 1.0). Even though this systematic review was limited due to articles of small sample sizes and considerable heterogeneity, the results indicate that flow diverting devices and covered stents are good therapeutic options for endoluminal reconstruction of iatrogenic ICA injuries following endonasal surgery.
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Affiliation(s)
- Mohammad Ghorbani
- Division of Vascular and Endovascular Neurosurgery, Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Christoph J Griessenauer
- Department of Neurosurgery, Geisinger Health System, Danville, PA, USA.,Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria
| | - Hamidreza Shojaei
- Department of Neurosurgery, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran.
| | | | - Ebrahim Hejazian
- Department of Neurosurgery, Babol University of Medical Sciences, Babol, Mazandaran, Iran
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14
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Zheng Y, Lu Z, Shen J, Xu F. Intracranial Pseudoaneurysms: Evaluation and Management. Front Neurol 2020; 11:582. [PMID: 32733358 PMCID: PMC7358534 DOI: 10.3389/fneur.2020.00582] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 05/20/2020] [Indexed: 12/04/2022] Open
Abstract
Intracranial pseudoaneurysms account for about 1% of intracranial aneurysms with a high mortality. The natural history of intracranial pseudoaneurysm is not well-understood, and its management remains controversial. This review provides an overview of the etiology, pathophysiology, clinical presentation, imaging, and management of intracranial pseudoaneurysms. Especially, this article emphasizes the factors that should be considered for the most appropriate management strategy based on the risks and benefits of each treatment option.
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Affiliation(s)
- Yongtao Zheng
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China
| | - Zheng Lu
- Department of Neurosurgery, Hai'an People's Hospital, Nantong, China
| | - Jianguo Shen
- Department of Neurosurgery, Second Affiliated Hospital of Jiaxiang University, Jiaxing, China
| | - Feng Xu
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China.,Department of Neurosurgery, Kashgar Prefecture Second People's Hospital, Kashgar, China
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15
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Zhang Y, Tian Z, Li C, Liu J, Zhang Y, Yang X, Zhang Y. A modified endovascular treatment protocol for iatrogenic internal carotid artery injuries following endoscopic endonasal surgery. J Neurosurg 2020; 132:343-350. [PMID: 30684942 DOI: 10.3171/2018.8.jns181048] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 08/28/2018] [Indexed: 01/03/2023]
Abstract
OBJECTIVE Internal carotid artery (ICA) injuries during endoscopic endonasal surgery (EES) are catastrophic complications. Alongside the advancements in medical instrumentation and material, there is a need to modify previous treatment modalities and principles. METHODS A retrospective review of 3658 patients who underwent EES performed at the authors' institution between January 2012 and December 2017 was conducted. Ultimately, 20 patients (0.55%) with ICA injury following EES were enrolled for analysis. Data collection included demographic data, preoperative diagnosis, injury setting, repair method, and immediate and follow-up angiographic and clinical outcomes. RESULTS Among the 20 patients, 11 received immediate endovascular therapy and 9 were treated only with packing. Of the 11 patients who received endovascular treatment, 6 were treated by covered stent and 5 by parent artery occlusion (PAO). The preservation rate of injured ICA increased from 20.0% (1 of 5) to 83.3% (5 of 6) after the Willis covered stent graft became available in January 2016. Of the 20 patients in the study, 19 recovered well and 1 patient-who had a pseudoaneurysm and was treated by PAO with a detachable balloon-suffered epistaxis after the hemostat in her nasal cavity was removed in ward, and she died later that day. The authors speculated that the detachable balloon had shifted to the distal part of ICA, although the patient could not undergo a repeat angiogram because she quickly suffered shock and could not be transferred to the catheter room. After the introduction of a hybrid operating room (OR), one patient whose first angiogram showed no ICA injury was found to have a pseudoaneurysm. He received endovascular treatment when he was brought for a repeat angiogram 5 days later in the hybrid OR after removing the hemostat in his nasal cavity. Of the 4 surviving patients treated with PAO, no external carotid artery-ICA bypass was required. The authors propose a modified endovascular treatment protocol for ICA injuries suffered during EES that exploits the advantage of the covered stent graft and the hybrid OR. CONCLUSIONS The endovascular treatment protocol used in this study for ICA injuries during EES was helpful in the management of this rare complication. Willis stent placement improved the preservation rate of injured ICA during EES. It would be highly advantageous to manage this complication in a hybrid OR or by a mobile C-arm to get a clear intraoperative angiogram.
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Affiliation(s)
- Yisen Zhang
- Departments of1Interventional Neuroradiology and
| | | | - Chuzhong Li
- 2Neurosurgery, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University.,3Key Laboratory of Central Nervous System Injury Research, Beijing.,4Beijing Institute for Brain Disorders Brain Tumor Center; and.,5China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Jian Liu
- Departments of1Interventional Neuroradiology and
| | - Ying Zhang
- Departments of1Interventional Neuroradiology and
| | - Xinjian Yang
- Departments of1Interventional Neuroradiology and
| | - Yazhuo Zhang
- 2Neurosurgery, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University.,3Key Laboratory of Central Nervous System Injury Research, Beijing.,4Beijing Institute for Brain Disorders Brain Tumor Center; and.,5China National Clinical Research Center for Neurological Diseases, Beijing, China
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16
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Nariai Y, Kawamura Y, Takigawa T, Hyodo A, Suzuki K. Pipeline embolization for an iatrogenic intracranial internal carotid artery pseudoaneurysm after transsphenoidal pituitary tumor surgery: Case report and review of the literature. Interv Neuroradiol 2019; 26:74-82. [PMID: 31505983 DOI: 10.1177/1591019919874943] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Intracranial pseudoaneurysms are uncommon and among the most difficult lesions to treat with surgery or endovascular means without parent artery sacrifice. Here, we report on a patient who underwent successful treatment using a flow-diverting stent for an iatrogenic intracranial internal carotid artery pseudoaneurysm following a vessel injury after endoscopic pituitary tumor resection via the transsphenoidal approach. A 62-year-old man with a Rathke's cleft cyst presenting with bitemporal hemianopia and progressive decline of left visual acuity underwent endoscopic transsphenoidal pituitary tumor resection. During dura incision, brisk arterial bleeding was encountered from the right internal carotid artery. Immediate packing was performed, and hemostasis was achieved. Three days after the vessel injury, an angiography revealed a pseudoaneurysm (2.9 × 2.1 mm) at the cavernous segment of the right internal carotid artery, which showed enlargement on follow-up magnetic resonance imaging at six days postoperatively. Pipeline embolization was performed nine days after the vessel injury. Angiography performed one month after Pipeline embolization revealed significant stagnation but not complete occlusion of blood flow inside the pseudoaneurysm cavity. Dual antiplatelet therapy was replaced with single antiplatelet therapy. Follow-up angiograms three months after Pipeline embolization confirmed complete obliteration of the pseudoaneurysm and successful endoluminal reconstruction of the damaged vessel. Despite the possibility of short-term bleeding and the need for dual antiplatelet therapy administration for a certain period, the use of flow-diverting stents is a feasible vessel-sparing option in the management of intracranial internal carotid artery pseudoaneurysms resulting from transsphenoidal surgery injuries if intraoperative hemodynamic stability can be achieved with effective packing.
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Affiliation(s)
- Yasuhiko Nariai
- Department of Neurosurgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Yosuke Kawamura
- Department of Neurosurgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Tomoji Takigawa
- Department of Neurosurgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Akio Hyodo
- Department of Neurosurgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
| | - Kensuke Suzuki
- Department of Neurosurgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
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17
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Chen SH, McCarthy DJ, Sheinberg D, Hanel R, Sur S, Jabbour P, Atallah E, Chalouhi N, Dumont A, Amenta P, Hasan D, Raper D, Liu K, Jane JA, Crowley RW, Aguilar-Salinas P, Bentley J, Monteith S, Mitchell BD, Yavagal DR, Peterson EC, Starke RM. Pipeline Embolization Device for the Treatment of Intracranial Pseudoaneurysms. World Neurosurg 2019; 127:e86-e93. [PMID: 30849553 DOI: 10.1016/j.wneu.2019.02.135] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 02/16/2019] [Accepted: 02/18/2019] [Indexed: 12/01/2022]
Abstract
BACKGROUND Intracranial pseudoaneurysms (PSAs) are associated with high rupture and mortality rates and have traditionally been treated by parent vessel sacrifice. There has been recent interest in using flow-diverting devices for treatment of these complex lesions while preserving flow through the parent artery. The objective of this study is to examine the safety and efficacy of these devices in the treatment of intracranial PSA. METHODS We performed a multi-institutional retrospective study of intracranial PSAs treated with the Pipeline Embolization Device (PED) between 2014 and 2017 at 7 institutions. Complications and clinical and radiographic outcomes were reviewed. RESULTS A total of 19 patients underwent PED placement for intracranial PSA. Iatrogenic injury and trauma comprised most etiologies in our series. The mean pseudoaneurysm diameter was 8.8 mm, and 18 of 19 PSAs (95%) involved the internal carotid artery (ICA). Multiple PEDs were deployed in a telescoping fashion in 7 patients (37%). Of the 18 patients with follow up imaging, 14 (78%) achieved complete pseudoaneurysm obliteration and 2 achieved near-complete obliteration (11%). Two patients (11%) were found to have significant pseudoaneurysm progression on short-term follow-up and required ICA sacrifice. No patients experienced new neurologic deficits or deterioration secondary to PED placement. No patients experienced bleeding or rebleeding from PSA. CONCLUSIONS In well-selected patients, the use of flow-diverting stents may be a feasible alternative to parent vessel sacrifice. Given the high morbidity and mortality associated with PSA, we recommend short- and long-term radiographic follow-up for patients treated with flow-diverting stents.
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Affiliation(s)
- Stephanie H Chen
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
| | - David J McCarthy
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA.
| | - Dallas Sheinberg
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
| | - Ricardo Hanel
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA; Department of Neurological Surgery, Baptist Health, Miami, Florida, USA
| | - Samir Sur
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
| | - Pascal Jabbour
- Department of Neurological Surgery, Jefferson University, Philadelphia, Pennsylvania, USA
| | - Elias Atallah
- Department of Neurological Surgery, Jefferson University, Philadelphia, Pennsylvania, USA
| | - Nohra Chalouhi
- Department of Neurological Surgery, Jefferson University, Philadelphia, Pennsylvania, USA
| | - Aaron Dumont
- Department of Neurological Surgery, Tulane Medical Center, New Orleans, Louisiana, USA
| | - Peter Amenta
- Department of Neurological Surgery, Tulane Medical Center, New Orleans, Louisiana, USA
| | - David Hasan
- Department of Neurological Surgery, University of Iowa, Iowa City, Iowa, USA
| | - Daniel Raper
- Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA
| | - Kenneth Liu
- Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA
| | - John A Jane
- Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA
| | - R Webster Crowley
- Department of Neurological Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | | | - Josh Bentley
- Department of Neurological Surgery, Swedish Health, Seattle, Washington, USA
| | - Stephen Monteith
- Department of Neurological Surgery, Swedish Health, Seattle, Washington, USA
| | - Bartley D Mitchell
- Department of Neurological Surgery, Methodist Institute, Houston, Texas, USA
| | - Dileep R Yavagal
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
| | - Eric C Peterson
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
| | - Robert M Starke
- Department of Neurological Surgery, University of Miami, Miami, Florida, USA
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