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Calvanese F, Auricchio AM, Pohjola A, Hafez A, Nurminen V, Korja M, Numminen J, Lehecka M, Raj R, Niemelä M. Changes in treatment of intracranial aneurysms during the last decade in a large European neurovascular center. Acta Neurochir (Wien) 2024; 166:173. [PMID: 38594469 PMCID: PMC11004042 DOI: 10.1007/s00701-024-06064-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Accepted: 03/26/2024] [Indexed: 04/11/2024]
Abstract
OBJECTIVE Treatment modality for ruptured and unruptured intracranial aneurysms has shifted during the last two decades from microsurgical treatment towards endovascular treatment. We present how this transition happened in a large European neurovascular center. METHODS We conducted a retrospective observational study consecutive patients treated for an unruptured or ruptured intracranial aneurysm at Helsinki University Hospital during 2012-2022. We used Poisson regression analysis to report age-adjusted treatment trends by aneurysm location and rupture status. RESULTS A total of 2491 patients with intracranial aneurysms were treated (44% ruptured, 56% unruptured): 1421 (57%) surgically and 1070 (43%) endovascularly. A general trend towards fewer treated aneurysms was noted. The proportion of patients treated surgically decreased from 90% in 2012 to 20% in 2022. The age-adjusted decrease of surgical versus endovascular treatment was 6.9%/year for all aneurysms, 6.8% for ruptured aneurysms, and 6.8% for unruptured aneurysms. The decrease of surgical treatment was most evident in unruptured vertebrobasilar aneurysms (10.8%/year), unruptured communicating artery aneurysms (10.1%/year), ruptured communicating artery aneurysms (10.0%/year), and ruptured internal carotid aneurysms (9.0%/year). There was no change in treatment modality for middle cerebral artery aneurysms, of which 85% were still surgically treated in 2022. A trend towards an increasing size for treated ruptured aneurysms was found (p = 0.033). CONCLUSION A significant shift of the treatment modality from surgical to endovascular treatment occurred for all aneurysm locations except for middle cerebral artery aneurysms. Whether this shift has affected long-term safety and patient outcomes should be assessed in the future.
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Affiliation(s)
- Francesco Calvanese
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Anna Maria Auricchio
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
- Department of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Anni Pohjola
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Ahmad Hafez
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Ville Nurminen
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Miikka Korja
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Jussi Numminen
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Martin Lehecka
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
| | - Rahul Raj
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland.
| | - Mika Niemelä
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4, Po Box 320, 00029 HUS, Helsinki, Finland
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Sternbach S, Nguyen VN, Sizdahkhani S, Abedi A, Rennert RC, Atai NA, Khahera AS, Carey JN, Russin JJ. Open Surgical Treatment of Middle Cerebral Artery Aneurysms: A Single-Center Series in the Endovascular Era. World Neurosurg 2024; 184:e577-e585. [PMID: 38336208 DOI: 10.1016/j.wneu.2024.01.172] [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: 12/09/2023] [Revised: 01/31/2024] [Accepted: 01/31/2024] [Indexed: 02/12/2024]
Abstract
OBJECTIVE We review the outcomes of open surgical treatment of middle cerebral artery aneurysms (MCAAs) at a single center, focusing on aneurysm obliteration rates and functional outcomes at the most recent follow-up. These findings can be used for future comparisons of surgical outcomes with MCAAs. METHODS We retrospectively reviewed cases from a prospectively maintained database of patients receiving open surgical treatment for ruptured or unruptured MCAAs between July 2014 and December 2022. We utilized patients' modified Rankin Scale (mRS) score and Glasgow Outcome Scale score as functional outcome measures. Means, standard deviations, medians, and interquartile ranges were calculated, and a student's t test or its nonparametric equivalent was used to compare subgroups. RESULTS One hundred fifty patients (114 women, 76%; mean age 55.0 ± 14.7 years) with a total of 156 MCAAs comprised 152 cases; 85 (56%) ruptured and 71 (46%) unruptured. Bypass was performed in 34 cases (22.4%); 18 ruptured (51.4%) and 16 unruptured (48.6%). Intraoperative rupture occurred in 5 (5%) ruptured and 1 (2%) unruptured cases. Onwe hundred forty-five patients (95.4%) had aneurysm obliteration with initial surgery, with 98.4% of patients having complete occlusion at 40.2± 65.5 weeks of follow-up. Intrahospital mortality occurred in 7 (6.9%) ruptured versus 1 (2.0%) unruptured case. Fifty-two (51.5%) of the ruptured compared to 43 (86%) unruptured patients were discharged home, with the remaining patients requiring inpatient rehabilitation or long-term hospitalization. The ruptured group had a mean hospital stay of 18.4 ± 10.5 days versus. 5.7 ± 6.0 days for unruptured. Length of stay, discharge mRS/ Glasgow Outcome Scale, and mRS at 4-6 weeks favored unruptured cases (P < 0.0001-0.0336). Mean change in mRS from presentation to last follow-up favored ruptured cases (-0.7 ± 1.2 vs. -0.04 ± 1.2, P = 0.0215). CONCLUSIONS Open surgery remains a safe and definitive treatment option for MCAAs in the endovascular era.
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Affiliation(s)
- Sarah Sternbach
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Vincent N Nguyen
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Saman Sizdahkhani
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Aidin Abedi
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA; Neurorestoration Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Robert C Rennert
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Nadia A Atai
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA; Neurorestoration Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Anadjeet S Khahera
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Joseph N Carey
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Jonathan J Russin
- Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA; Neurorestoration Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
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3
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Zhou Z, Lan W, Yu J. Endovascular treatment of middle cerebral artery aneurysms: current status and future prospects. Front Neurol 2023; 14:1239199. [PMID: 38033773 PMCID: PMC10684741 DOI: 10.3389/fneur.2023.1239199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 10/20/2023] [Indexed: 12/02/2023] Open
Abstract
Middle cerebral artery (MCA) aneurysms are complex and widely distributed throughout the course of the MCA. Various types of aneurysms can occur in the MCA. Ruptured as well as unruptured MCA aneurysms may require treatment to avoid bleeding or rebleeding. Currently, clipping is regarded as the first-line choice for the treatment of MCA aneurysms. However, endovascular treatment (EVT) is emerging as an alternative treatment in selected cases. EVT techniques vary. Therefore, it is necessary to review EVT for MCA aneurysms. In this review, the following issues were discussed: MCA anatomy and anomalies, classifications of MCA aneurysms, the natural history of MCA aneurysms, EVT status and principle, deployments of traditional coiling techniques and flow diverters (FDs), and deployments and prospects of intrasaccular flow disruptors and stent-like devices. According to the review and our experience, traditional coiling EVT is still the preferred therapy for most MCA aneurysms. FD deployment can be used in selective MCA aneurysms. Parent artery occlusion (PAO) can be used to treat distal MCA aneurysms. In addition, new devices can be used to treat MCA aneurysms, such as intrasaccular flow disruptors and stent-like devices. In general, EVT is gaining popularity as an alternative treatment option; however, there is still a lack of evidence regarding EVT, and longer-term data are not currently available for most EVT devices.
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Affiliation(s)
- Zibo Zhou
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Wenjing Lan
- Department of Radiology, First Hospital of Jilin University, Changchun, China
| | - Jinlu Yu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
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Diestro JDB, Li Y, Kishore K, Omar AT, Montanera W, Sarma D, Marotta TR, Spears J, Bharatha A. A shift from open to endovascular repair in the treatment of ruptured middle cerebral artery aneurysms: a single institution experience. Neuroradiology 2023; 65:1353-1361. [PMID: 37480480 DOI: 10.1007/s00234-023-03195-w] [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: 03/02/2023] [Accepted: 07/07/2023] [Indexed: 07/24/2023]
Abstract
PURPOSE Middle cerebral aneurysms were underrepresented in the two largest trials (BRAT and ISAT) for the treatment of ruptured intracranial aneurysms. Recent institutional series addressing the choice between endovascular or open repair for this subset of aneurysms are few and have not yielded a definitive conclusion. We compare clinical outcomes of patients presenting with acute subarachnoid hemorrhage from ruptured middle cerebral artery aneurysms undergoing either open or endovascular repair. METHODS We conducted a retrospective review of 138 consecutive patients with ruptured middle cerebral artery aneurysms admitted into our institution from January 2008 to March 2019 to compare endovascular and open surgical outcomes. RESULTS Of the ruptured middle cerebral artery aneurysms, 57 underwent endovascular repair while 81 were treated with open surgery. Over the study period, there was a notable shift in practice toward more frequent endovascular treatment of ruptured MCA aneurysms (31% in 2008 vs. 91% in 2018). At discharge (49.1% vs 29.6%; p = .002) and at 6 months (84.3% vs 58.6%; p = 0.003), patients who underwent endovascular repair had a higher proportion of patients with good clinical outcomes (mRS 0-2) compared to those undergoing open surgery. Long-term follow-up data (endovascular 54.9 ± 37.9 months vs clipping 18.6 ± 13.4 months) showed no difference in rebleeding (1.8% vs 3.7%, p = 0.642) and retreatment (5.3% vs 3.7%, p = 0.691) in both groups. CONCLUSION Our series suggests equipoise in the treatment of ruptured middle cerebral artery aneurysms and demonstrates endovascular repair as a potentially feasible treatment strategy. Future randomized trials could clarify the roles of these treatment modalities.
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Affiliation(s)
- Jose Danilo Bengzon Diestro
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada.
| | - Yangmei Li
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
| | - Kislay Kishore
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
| | - Abdelsimar T Omar
- Department of Surgery, Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, Canada
| | - Walter Montanera
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
| | - Dipanka Sarma
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
- Department of Surgery, Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, Canada
| | - Thomas R Marotta
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
- Department of Surgery, Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, Canada
| | - Julian Spears
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
- Department of Surgery, Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, Canada
| | - Aditya Bharatha
- Department of Medical Imaging, Division of Diagnostic and Therapeutic Neuroradiology, St Michael's Hospital, University of Toronto, Toronto, Canada
- Department of Surgery, Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, Canada
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Xenofontos A, Raffalli-Ebezant H, Madhavan A, Khan H, Mastan A, Russell I, Dulhanty L, Patel HC, Hilditch CA. Simple endovascular coiling: An effective long-term solution for wide-necked ruptured middle cerebral artery aneurysms? A 10-years retrospective study. Neuroradiol J 2022; 35:573-579. [PMID: 35037769 PMCID: PMC9513924 DOI: 10.1177/19714009211067406] [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] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Endovascular coiling is usually the first line treatment modality for most ruptured intracranial aneurysms. However, there is still some debate as to whether microsurgical clipping or coiling is the treatment of choice for complex wide-necked ruptured middle cerebral artery (MCA) aneurysms. Our aim was to assess the efficacy, safety and longevity of simple endovascular coiling for ruptured MCA aneurysms. METHODS This was a single-centre 10 years retrospective study (2008-2019) of all endovascularly treated patients with ruptured MCA aneurysms (n = 148). Patients were treated with simple coiling (n = 111), balloon-assisted coiling (n = 13), dual micro-catheter coiling (n = 19), balloon-assisted and dual micro-catheter coiling (n = 4) and woven endobridge (WEB) device (n = 1). The standard follow-up protocol consisted of Magnetic Resonance angiography at 6, 12 and 24 months. Our primary endpoints were mortality at 2, 12 and 24 months and dependency at discharge. Secondary endpoints included aneurysm occlusion, complications, re-canalisation, rebleeding and retreatment rates. RESULTS All-cause mortality at 2, 12 and 24 months was 4.7% (n = 7), 8.1% (n = 12) and 10.8% (n = 16), respectively. 81.3% of patients remained independent in activities of daily livings (ADLs) at the point of discharge. Over a mean follow-up period of 19.7 months, we demonstrated re-bleeding and re-treatment rates of 2.7% (n = 4) and 4.1% (n = 6) respectively. Complete occlusion was achieved in 54% (n = 79) of aneurysms, with recanalisation observed in 18.2% (n = 27) of the patients. CONCLUSIONS Our results demonstrate that simple endovascular coiling techniques offer a safe and effective solution in the management of ruptured MCA aneurysms without the requirement for re-treatment either surgically or endovascularly using endoluminal stents or other devices.
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Affiliation(s)
- Andreas Xenofontos
- Department of Neuroradiology, Salford Royal NHS Foundation
Trust, Salford, UK
| | | | - Aparna Madhavan
- Department of Neuroradiology, Salford Royal NHS Foundation
Trust, Salford, UK
| | - Haroon Khan
- Department of Neuroradiology, Salford Royal NHS Foundation
Trust, Salford, UK
| | - Aliya Mastan
- Department of Neuroradiology, Salford Royal NHS Foundation
Trust, Salford, UK
| | - Ian Russell
- Department of Neuroradiology, Salford Royal NHS Foundation
Trust, Salford, UK
| | - Louise Dulhanty
- Department of Neurosurgery, Salford Royal NHS Foundation
Trust, Salford, UK
| | - Hiren C Patel
- Department of Neurosurgery, Salford Royal NHS Foundation
Trust, Salford, UK
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Xue G, Zhou Y, Liu P, Zuo Q, Yang P, Fang Y, Li Q, Zhao R, Xu Y, Hong B, Huang Q, Liu J. Endovascular Treatment of Ruptured Middle Cerebral Artery Aneurysms With a Low-Profile Visualized Intraluminal Support Device. Front Neurol 2021; 11:631745. [PMID: 33584524 PMCID: PMC7876053 DOI: 10.3389/fneur.2020.631745] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 12/28/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: Stenting in ruptured middle cerebral artery (MCA) aneurysms was reported with a high perioperative complication rate. However, the treatment devices and physician's experience have continued to evolve. We performed this retrospective study to evaluate the safety and efficacy of LVIS stent-assisted coiling for ruptured MCA aneurysms. Methods: Patients with acutely ruptured MCA aneurysms treated between November 2014 and October 2019 were retrospectively reviewed. Clinical and angiographic data of those treated with LVIS stents were collected from a prospectively maintained database. Results: A total of 40 patients with 40 ruptured MCA aneurysms were enrolled, which comprised 26.3% (40/152) of all the ruptured MCA aneurysms at the same time. All stents were successfully deployed except for one (2.5%), which had a poor stent opening. Ischemic procedure-related complications were encountered in three patients (7.5%). One patient died of complications related to high-grade SAH on admission. Follow-up (mean 15.9 months) angiography was performed for 36 patients, which showed 33 (91.7%) aneurysms were completely occluded, 1 (2.8%) was improved, 1 (2.8%) was stable, and 1 (2.8%) was recanalized. Clinical follow-up (mean 29.6 months) was available for all survived patients, which showed 38 (95.0%) patients had favorable neurologic outcomes (mRS score 0–2), and 2 (5.0%) patients had poor neurologic outcomes. Conclusion: The use of LVIS stents is feasible, safe, and effective with glycoprotein IIb/IIIa inhibitor for the treatment of ruptured MCA aneurysms in the acute setting. Prospective, multicenter studies with larger sample sizes are still required to further evaluate the safety and long-term efficacy.
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Affiliation(s)
- Gaici Xue
- Department of Neurosurgery, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | - Yu Zhou
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Peng Liu
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Qiao Zuo
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Pengfei Yang
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yibin Fang
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Qiang Li
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Rui Zhao
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Yi Xu
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Bo Hong
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Qinghai Huang
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Jianmin Liu
- Department of Neurosurgery, Changhai Hospital, Second Military Medical University, Shanghai, China
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Procedural Complications and Factors Influencing Immediate Angiographic Results after Endovascular Treatment of Small (<5 mm) Ruptured Intracranial Aneurysms. J Stroke Cerebrovasc Dis 2020; 29:104624. [DOI: 10.1016/j.jstrokecerebrovasdis.2019.104624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/20/2019] [Accepted: 12/22/2019] [Indexed: 11/21/2022] Open
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Endovascular treatment of small (< 5 mm) unruptured middle cerebral artery aneurysms. Pol J Radiol 2019; 84:e198-e204. [PMID: 31481991 PMCID: PMC6717937 DOI: 10.5114/pjr.2019.84829] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 02/18/2019] [Indexed: 01/09/2023] Open
Abstract
Purpose We report our experience with endovascular treatment of these lesions, with special consideration of angiographic and clinical outcomes and periprocedural complications. Material and methods The analysis included treatment results of 19 patients with 20 aneurysms. The aneurysm size ranged from 1.9 to 4.7 mm (mean 3.8, SD 0.7). Clinical examinations with the use of modified Rankin Score and angiographic outcomes were evaluated initially postembolisation and at a minimum follow-up of six months. Results Initial post-treatment complete and near-complete aneurysm occlusion was achieved in 19 (95%) cases and incomplete occlusion in one (5%) case. Imaging follow-up, performed in 17 (89.4%) patients, showed no change in the degree of occlusion in 16 (94.1%) patients and coil compaction in one (5.9%). There were no retreatment procedures. The procedure-related mortality rate was 5% (1/20) and was associated with intraprocedural aneurysm rupture. There was a case of a clinically silent coil prolapse into the parent artery. The clinical follow-up evaluation achieved in 17 (89.4%) patients showed no change in clinical status in all followed patients. Conclusions Endovascular treatment of small unruptured middle cerebral artery aneurysms is feasible and effective. The procedure-related complications are not negligible, especially in terms of the benign natural course of these lesions.
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