Initial experience with aneurysm coiling in Nepal

The aim of this study is to show the result of aneurysm coiling despite the difficulty in initiating neurointervention in Nepal. It is a retrospective study where only aneurysm that has undergone coiling are taken from 2017 to 2018.A total of eleven patients (male: female = 1: 10) with aneurysm were treated with Endovascular therapy. 9 cases were ruptured aneurysm while 3 were unruptured. 5 aneurysm were located in anterior circulation while 6 were located in posterior circulation. Out of eleven cases 4 were treated by simple coiling technique, while 2 underwent balloon assisted coiling, 3 stent assisted coiling, 1 pConus assisted coiling and 1 simple coiling and stent assisted coiling. Statistical analysis showed significant correlation between fisher grading scale with mRS score (P=0.013) suggesting lower fisher grade, and improved outcome similar to the result of prospective one year follow up of Barrow Ruptured Aneurysm Trial ( BRAT) study. With limited resources aneurysm coiling was performed at ANIAS with similar results to literature.Nepal Journal of Neuroscience, Volume 15, Number 2, 2018, page: 30-35

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The Barrow Ruptured Aneurysm Trial: 3-year results

Journal of Neurosurgery ◽

10.3171/2013.3.jns12683 ◽

2013 ◽

Vol 119 (1) ◽

pp. 146-157 ◽

Cited By ~ 183

Author(s):

Robert F. Spetzler ◽

Cameron G. McDougall ◽

Felipe C. Albuquerque ◽

Joseph M. Zabramski ◽

Nancy K. Hills ◽

...

Keyword(s):

Coil Embolization ◽

Posterior Circulation ◽

Ruptured Aneurysm ◽

Absolute Difference ◽

Anterior Circulation ◽

Poor Outcome ◽

Significant Difference ◽

Clip Occlusion ◽

Anterior Circulation Aneurysms

Object The authors report the 3-year results of the Barrow Ruptured Aneurysm Trial (BRAT). The objective of this ongoing randomized trial is to compare the safety and efficacy of microsurgical clip occlusion and endovascular coil embolization for the treatment of acutely ruptured cerebral aneurysms and to compare functional outcomes based on clinical and angiographic data. The 1-year results have been previously reported. Methods Two-hundred thirty-eight patients were assigned to clip occlusion and 233 to coil embolization. There were no anatomical exclusions. Crossovers were allowed based on the treating physician's determination, but primary outcome analysis was based on the initial assignment to treatment modality. Patient outcomes were assessed independently using the modified Rankin Scale (mRS). A poor outcome was defined as an mRS score > 2. At 3 years' follow-up 349 patients who had actually undergone treatment were available for evaluation. Of the 170 patients who had been originally assigned to coiling, 64 (38%) crossed over to clipping, whereas 4 (2%) of 179 patients assigned to surgery crossed over to coiling. Results The risk of a poor outcome in patients assigned to clipping compared with those assigned to coiling (35.8% vs 30%) had decreased from that observed at 1 year and was no longer significant (OR 1.30, 95% CI 0.83–2.04, p = 0.25). In addition, the degree of aneurysm obliteration (p = 0.0001), rate of aneurysm recurrence (p = 0.01), and rate of retreatment (p = 0.01) were significantly better in the group treated with clipping compared with the group treated with coiling. When outcomes were analyzed based on aneurysm location (anterior circulation, n = 339; posterior circulation, n = 69), there was no significant difference in the outcomes of anterior circulation aneurysms between the 2 assigned groups across time points (at discharge, 6 months, 1 year, or 3 years after treatment). The outcomes of posterior circulation aneurysms were significantly better in the coil group than in the clip group after the 1st year of follow-up, and this difference persisted after 3 years of follow-up. However, while aneurysms in the anterior circulation were well matched in their anatomical location between the 2 treatment arms, this was not the case in the posterior circulation where, for example, 18 of 21 posterior inferior cerebellar artery aneurysms were in the clip group. Conclusions Based on mRS scores at 3 years, the outcomes of all patients assigned to coil embolization showed a favorable 5.8% absolute difference compared with outcomes of those assigned to clip occlusion, although this difference did not reach statistical significance (p = 0.25). Patients in the clip group had a significantly higher degree of aneurysm obliteration and a significantly lower rate of recurrence and retreatment. In post hoc analysis examining only anterior circulation aneurysms, no outcome difference between the 2 treatment cohorts was observed at any recorded time point. Clinical trial registration no.: NCT01593267 (ClinicalTrials.gov).

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The Barrow Ruptured Aneurysm Trial: 6-year results

Journal of Neurosurgery ◽

10.3171/2014.9.jns141749 ◽

2015 ◽

Vol 123 (3) ◽

pp. 609-617 ◽

Cited By ~ 194

Author(s):

Robert F. Spetzler ◽

Cameron G. McDougall ◽

Joseph M. Zabramski ◽

Felipe C. Albuquerque ◽

Nancy K. Hills ◽

...

Keyword(s):

Coil Embolization ◽

Posterior Inferior Cerebellar Artery ◽

Posterior Circulation ◽

Ruptured Aneurysm ◽

Treatment Modalities ◽

Anterior Circulation ◽

Significant Difference ◽

Posterior Circulation Aneurysms ◽

Anterior Circulation Aneurysms

OBJECT The authors report the 6-year results of the Barrow Ruptured Aneurysm Trial (BRAT). This ongoing randomized trial, with the final goal of a 10-year follow-up, compares the safety and efficacy of surgical clip occlusion and endovascular coil embolization in patients presenting with subarachnoid hemorrhage (SAH) from a ruptured aneurysm. The 1- and 3-year results of this trial have been previously reported. METHODS In total, 500 patients with an SAH met the entry criteria and were enrolled in the study. Of these patients, 471 were randomly assigned to the treatments: 238 to surgical clipping and 233 to endovascular coiling. Six patients who died before treatment and 57 patients with nonaneurysmal SAHs were excluded, leaving a total of 408 patients who underwent clipping (209 assigned) or coiling (199 assigned). Whether to treat patients within the assigned group or to cross over patients to the other group was at the discretion of the treating physician; 38% (75/199) of the patients assigned to coiling were crossed over to clipping and 1.9% (4/209) assigned to clipping were crossed over to coiling. The outcome data were collected by a dedicated nurse practitioner. The primary outcome analysis was based on the assigned treatment group; poor outcome was defined as a modified Rankin Scale (mRS) score > 2 and was independently adjudicated. Six years after randomization, 336 (82%) of 408 patients who had been treated were available for examination. RESULTS On the basis of an mRS score of > 2, and similar to the results at the 3-year follow-up, no significant difference in outcomes (p = 0.24) was detected between the 2 treatment groups. Complete aneurysm obliteration at 6 years was achieved in 96% (111/116) of the clipping group and in 48% (23/48) of the coiling group (p < 0.0001). In the period between the 3- and 6-year follow-ups, 3 additional patients assigned to coiling and none assigned to clipping received retreatment, for overall retreatment rates of 4.6% (13/280) for clipping and 16.4% (21/128) for coiling (p < 0.0001). When aneurysm location was considered, the 6-year results continued to match the previously reported results, with no difference in outcome for anterior circulation aneurysms at most time points. Of the anterior circulation aneurysms assigned to coiling treatment, 42% (70/168) were crossed over to clipping treatment. The outcomes for posterior circulation aneurysms continued to favor coiling. The randomization process was unexpectedly skewed, with 18 of 21 treated aneurysms of the posterior inferior cerebellar artery (PICA) being assigned to clipping, but even when PICA aneurysms were removed from the analysis, outcomes for the posterior circulation aneurysms still favored coiling. CONCLUSIONS Although BRAT was statistically underpowered to detect small differences, these results suggest little difference in outcome between the 2 treatments for anterior circulation aneurysms. This was not the case for the posterior circulation aneurysms, where coil embolization appeared to provide a sustained advantage over clipping. Aneurysm obliteration rates in BRAT were significantly lower and retreatment rates significantly higher in the patients undergoing coiling than in those undergoing clipping. However, despite the fact that retreatment rates were higher after coiling, no recurrent hemorrhages were known to have occurred in patients undergoing coiling in BRAT who were followed up for 6 years. Sufficient questions remain about the relative benefits of the 2 treatment modalities to warrant further well-designed randomized trials.

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149 Emergency Clot Retrieval and Stenting for Posterior Circulation Stroke

British Journal of Surgery ◽

10.1093/bjs/znab134.234 ◽

2021 ◽

Vol 108 (Supplement_2) ◽

Author(s):

K Daga ◽

M T Ahmad ◽

M Taneja

Keyword(s):

Treatment Option ◽

Current Literature ◽

Basilar Artery ◽

Cerebral Angiography ◽

Posterior Circulation ◽

Anterior Circulation ◽

Acute Setting ◽

Post Procedure ◽

Basilar Artery Stenosis

Abstract The current literature regarding the morphology and presentations of strokes due to basilar artery stenosis/occlusion is limited. This pathology is a rare cause of stroke and its management is not clearly decided in guidelines or published literature. Moreover, posterior circulation strokes are reported to be more devastating than anterior circulation. We present a case of a 68-year-old male who presented in an acute setting with reduced consciousness, myoclonic jerks, weakness and nausea due to a stroke from an occluded mid-segment basilar artery. MRI showed evidence of left cerebellar and right occipital infarcts. Emergent cerebral angiography was performed, and he was immediately treated by thrombectomy and stenting (Stryker Wingspan stent). The patient made a full recovery within one week and remained well at follow-up 3 months post-procedure. Emergency recanalization of basilar artery strokes, by clot retrieval and stenting, should be considered as a treatment option.

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Normative distribution of posterior circulation tissue time-to-maximum: Effects of anatomic variation, tracer kinetics, and implications for patient selection in posterior circulation ischemic stroke

Journal of Cerebral Blood Flow & Metabolism ◽

10.1177/0271678x20982395 ◽

2021 ◽

pp. 0271678X2098239

Author(s):

Adam E Goldman-Yassen ◽

Matus Straka ◽

Michael Uhouse ◽

Seena Dehkharghani

Keyword(s):

Ischemic Stroke ◽

Selection Criteria ◽

Arterial Input Function ◽

Anatomic Variation ◽

Input Function ◽

Posterior Circulation ◽

Anterior Circulation ◽

Vessel Occlusion ◽

Perfusion Time

The generalization of perfusion-based, anterior circulation large vessel occlusion selection criteria to posterior circulation stroke is not straightforward due to physiologic delay, which we posit produces physiologic prolongation of the posterior circulation perfusion time-to-maximum (Tmax). To assess normative Tmax distributions, patients undergoing CTA/CTP for suspected ischemic stroke between 1/2018-3/2019 were retrospectively identified. Subjects with any cerebrovascular stenoses, or with follow-up MRI or final clinical diagnosis of stroke were excluded. Posterior circulation anatomic variations were identified. CTP were processed in RAPID and segmented in a custom pipeline permitting manually-enforced arterial input function (AIF) and perfusion estimations constrained to pre-specified vascular territories. Seventy-one subjects (mean 64 ± 19 years) met inclusion. Median Tmax was significantly greater in the cerebellar hemispheres (right: 3.0 s, left: 2.9 s) and PCA territories (right: 2.9 s; left: 3.3 s) than in the anterior circulation (right: 2.4 s; left: 2.3 s, p < 0.001). Fetal PCA disposition eliminated ipsilateral PCA Tmax delays (p = 0.012). Median territorial Tmax was significantly lower with basilar versus any anterior circulation AIF for all vascular territories (p < 0.001). Significant baseline delays in posterior circulation Tmax are observed even without steno-occlusive disease and vary with anatomic variation and AIF selection. The potential for overestimation of at-risk volumes in the posterior circulation merits caution in future trials.

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Abstract 120: Surpass Flow Diverter for Endovascular Treatment of Intracranial Aneurysms - A Multicenter Preliminary Clinical and Angiographic Experience in 161 Patients with 186 Aneurysms

Stroke ◽

10.1161/str.45.suppl_1.120 ◽

2014 ◽

Vol 45 (suppl_1) ◽

Author(s):

Ajay K Wakhloo ◽

Pedro Lylyk ◽

Joost de Vries ◽

Matthew J Gounis ◽

Alexandra Biondi ◽

...

Keyword(s):

Intracranial Aneurysms ◽

Experimental Studies ◽

Flow Diverter ◽

Posterior Circulation ◽

Parent Artery ◽

Anterior Circulation ◽

Neck Size ◽

Wide Range ◽

New Generation

Objective: Validated through experimental studies a new generation of flow diverters (Surpass™ FD) was evaluated for treatment of intracranial aneurysms (IA). We present our multicenter preliminary clinical and angiographic experience. METHODS: To achieve the calculated flow disruption between the parent artery and aneurysm for thrombosis, single FDs were placed endovascularly in parent arteries. Implants measured 2.5-5.3mm in diameter with a length of 10-80mm. Patients were enrolled harboring a wide range large and giant wide-neck, fusiform and multiple small and blister-type aneurysm. Clinical and angiographic follow-up were performed at 1-3, 6, and 12 months. RESULTS: A total of 186 consecutive IA in 161 patients (mean age 57.1 years) were treated at 33 centers. Fifty-three aneurysms were smaller than 5 mm, 64 were 5-9.9mm in diameter, 47 were 10-20mm in diameter, and 22 were larger than 20mm (10.4±0.7mm, neck size 6.0±0.5mm [mean±SEM]) . The aneurysms originated in 63.4% from the internal carotid artery; 22% and 14.5% of the lesions were located in the anterior circulation distal to Circle of Willis and posterior circulation respectively. Technical success was achieved in 182 aneurysms (98%); average number of devices used per aneurysm was 1.05. Permanent morbidity and mortality during the follow-up period of mean 8.4months (range 1-24 months) including periprocedural complications for patients with aneurysms of the anterior circulation were encountered in 5 (3.7%) and 2 (1.5 %) patients respectively and 1 (3.7%) and 4 (14.8%) respectively for patients with aneurysms of the posterior circulation location. One-hundred-ten patients (70.5%) harboring 127 (70.2%) were available for clinical and angiographic follow-up and showed a complete or near complete aneurysm occlusion in 63 (81.8%) of the ICA. Aneurysms of the ICA≥10mm that were completely covered by FD and not previously stent-treated with a minimum of 6 months follow-up available in 16 patients showed a complete obliteration in 81.3% (n=13) and >90% occlusion in remaining 3 patients. CONCLUSION: Preliminary data demonstrate high safety and efficacy of a new generation of FD for a wide range of IA of the anterior and posterior circulation with a single implant.

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Treatment of aneurysms in patients with moyamoya disease: a 10-year single-center experience

Journal of Neurosurgery ◽

10.3171/2017.3.jns162290 ◽

2018 ◽

Vol 128 (6) ◽

pp. 1813-1822 ◽

Cited By ~ 6

Author(s):

Wei Ni ◽

Hanqiang Jiang ◽

Bin Xu ◽

Yu Lei ◽

Heng Yang ◽

...

Keyword(s):

Moyamoya Disease ◽

Posterior Circulation ◽

Cerebral Revascularization ◽

Endovascular Coiling ◽

Single Center ◽

Anterior Circulation ◽

Main Trunk ◽

Aneurysm Embolization ◽

Peripheral Aneurysms

OBJECTIVEMoyamoya disease (MMD) is occasionally accompanied by intracranial aneurysms. The purpose of this study was to delineate the efficacy of the authors’ current surgical strategy in the management of MMD-associated aneurysms of different types.METHODSBetween January 2007 and March 2016, a consecutive cohort of 34 patients with 36 MMD-associated aneurysms was enrolled in this prospective single-center cohort study. The lesions were classified as peripheral (17 aneurysms) or main trunk aneurysms (13 in the anterior circulation and 6 in the posterior circulation). For the peripheral aneurysms, revascularization with or without endovascular treatment was suggested. For the main trunk aneurysms, revascularization alone, revascularization with aneurysm clipping, or revascularization with aneurysm embolization were used, depending on the location of the aneurysms.RESULTSOf the peripheral aneurysms, 4 were treated endovascularly with staged revascularization, and 13 were treated solely with cerebral revascularization. Of the 13 main trunk aneurysms in the anterior circulation, 10 were clipped followed by revascularization, and 3 were coiled followed by staged cerebral revascularization. Of the 6 main trunk aneurysms in the posterior circulation, 4 underwent endovascular coiling and 2 were treated solely with revascularization. One patient died of contralateral intracerebral hemorrhage 6 months after the operation. No other patients suffered recurrent intracranial hemorrhage, cerebral ischemia, or aneurysm rupture. An angiographic follow-up study showed that all the bypass grafts were patent. Complete occlusion was achieved in all 21 aneurysms that were clipped or embolized. Of the remaining 15 aneurysms that were not directly treated, 12 of 13 peripheral aneurysms were obliterated during the follow-up, whereas 1 remained stable; 1 of 2 posterior main trunk aneurysms remained stable, and the other became smaller.CONCLUSIONSThe authors’ current treatment strategy may benefit patients with MMD-associated aneurysms.

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Treatment Of Ruptured Tiny Intracranial Aneurysms By Electrocoagulation With Guidewire Manipulation:12 Cases Report

10.21203/rs.3.rs-30106/v1 ◽

2020 ◽

Author(s):

Lixia Xia ◽

Zhongfei Hao ◽

Hongjun Wang ◽

Yan Feng ◽

Yongxuan Zhan ◽

...

Keyword(s):

Intracranial Aneurysm ◽

Intracranial Aneurysms ◽

Large Scale ◽

Posterior Circulation ◽

Suitable Method ◽

Anterior Circulation ◽

Long Term Follow Up

Abstract Background: Ruptured tiny intracranial aneurysm (RTIA) is particularly rare seen. Treatment of RTIA is more difficult and not under control.Methods: We hereby present twelve rare cases of RTIA that were diagnosed based on DSA. These patients were found due to spontaneous or traumatic SAH, 11 of whom were treated only by electrocoagulation, and one of whom was treated by stent-assisted coiling and electrocoagulation.Results: There were eight patients with aneurysms located in posterior circulation and four patients with aneurysms located in anterior circulation. 11 patients were cured only by electrocoagulation merely: ten patient’ RTIA disappeared completely and immediately and another patient’s RTIA was thrombosed two months later. The twelfth patient was carried out stent-assisted coiling and electrocoagulation. The twelve patients’ average follow-up time was 12.5 months and the outcomes were all surprisingly excellent. No revascularization of aneurysm was found. Conclusions: Electrocoagulation with guidewire manipulation is a suitable method to treat RTIA. While large-scale studies with long-term follow-up are required to validate these promising results.

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An evaluation of the SAFIRE grading scale as a predictor of long-term outcomes for patients in the Barrow Ruptured Aneurysm Trial

Journal of Neurosurgery ◽

10.3171/2020.7.jns193431 ◽

2021 ◽

pp. 1-5

Author(s):

Joshua S. Catapano ◽

Mohamed A. Labib ◽

Fabio A. Frisoli ◽

Megan S. Cadigan ◽

Jacob F. Baranoski ◽

...

Keyword(s):

Univariate Analysis ◽

Ruptured Aneurysm ◽

Poor Outcome ◽

Increased Risk ◽

Grade Ii ◽

Grading Scale ◽

Poor Outcomes ◽

Grade Iii

OBJECTIVEThe SAFIRE grading scale is a novel, computable scale that predicts the outcome of aneurysmal subarachnoid hemorrhage (aSAH) patients in acute follow-up. However, this scale also may have prognostic significance in long-term follow-up and help guide further management.METHODSThe records of all patients enrolled in the Barrow Ruptured Aneurysm Trial (BRAT) were retrospectively reviewed, and the patients were assigned SAFIRE grades. Outcomes at 1 year and 6 years post-aSAH were analyzed for each SAFIRE grade level, with a poor outcome defined as a modified Rankin Scale score > 2. Univariate analysis was performed for patients with a high SAFIRE grade (IV or V) for odds of poor outcome at the 1- and 6-year follow-ups.RESULTSA total of 405 patients with confirmed aSAH enrolled in the BRAT were analyzed; 357 patients had 1-year follow-up, and 333 patients had 6-year follow-up data available. Generally, as the SAFIRE grade increased, so did the proportion of patients with poor outcomes. At the 1-year follow-up, 18% (17/93) of grade I patients, 22% (20/92) of grade II patients, 32% (26/80) of grade III patients, 43% (38/88) of grade IV patients, and 75% (3/4) of grade V patients were found to have poor outcomes. At the 6-year follow-up, 29% (23/79) of grade I patients, 24% (21/89) of grade II patients, 38% (29/77) of grade III patients, 60% (50/84) of grade IV patients, and 100% (4/4) of grade V patients were found to have poor outcomes. Univariate analysis showed that a SAFIRE grade of IV or V was associated with a significantly increased risk of a poor outcome at both the 1-year (OR 2.5, 95% CI 1.5–4.2; p < 0.001) and 6-year (OR 3.7, 95% CI 2.2–6.2; p < 0.001) follow-ups.CONCLUSIONSHigh SAFIRE grades are associated with an increased risk of a poor recovery at late follow-up.

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Coiling Occlusion of the Vertebral Artery for a Patient with Recurrent Posterior Circulation TIAs

The Neuroradiology Journal ◽

10.1177/197140091302600113 ◽

2013 ◽

Vol 26 (1) ◽

pp. 80-83 ◽

Cited By ~ 1

Author(s):

J. Chembala ◽

C. Jadun ◽

I. Natarajan ◽

C. Roffe

Keyword(s):

Vertebral Artery ◽

Artery Occlusion ◽

Posterior Circulation ◽

Left Vertebral Artery ◽

Antithrombotic Treatment ◽

Artery Embolization ◽

Transient Ischaemic Attacks ◽

Cerebral Embolization ◽

One Year

Recurrent posterior circulation infarcts frequently involve multiple vascular territories, suggesting an embolic source. We describe a patient with left vertebral artery occlusion who had recurrent transient ischaemic attacks due to cerebral embolization originating from the occluded vertebral artery in spite of optimal anticoagulant and antithrombotic treatment. This was successfully managed by coiling occlusion of the vertebral artery with no recurrence of symptoms over one year of follow-up. To our knowledge, this is the first report of coiling occlusion in the treatment of recurrent vertebral artery embolization.

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Microstent-Assisted Coiling for Wide-Necked Intracranial Aneurysms

Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques ◽

10.1017/s0317167100016917 ◽

2005 ◽

Vol 32 (1) ◽

pp. 71-81 ◽

Cited By ~ 43

Author(s):

Marlise Peruzzo dos Santos Souza ◽

Ronit Agid ◽

Robert A. Willinsky ◽

Michael Cusimano ◽

Walter Montanera ◽

...

Keyword(s):

Endovascular Treatment ◽

Intracranial Aneurysms ◽

Neurological Complication ◽

Posterior Circulation ◽

Technical Failure ◽

Anterior Circulation ◽

Neck Size ◽

Clinical Complications ◽

Class 1

Objective:To describe the results, technical feasibility, efficacy and challenges encountered in our preliminary experience using a self-expandable microstent, optimized for intracranial use, as an adjunct in the endovascular treatment of wide-necked aneurysms.Methods:Only broad-necked aneurysms (dome-to-neck ratio £2, or an isolated neck size > 4.5 mm) were treated with Neuroform microstent from July 2003 to May 2004. The techniques used for stent deployment were either parallel or sequential. Angiographic results were recorded immediately for all patients and classified as Class 1 (complete occlusion), Class 2 (neck remnant) or Class 3 (sac remnant) by three interventional neuroradiologists not involved in the procedure. Follow-up angiography at six months was obtained for one case. Modified Rankin Score scale was assessed for all patients.Results:Seventeen intracranial aneurysms in a total of 18 patients were treated (mean age, 52.2 yr). Eight patients (44.4%) presented with acute subarachnoid hemorrhage. Eleven aneurysms (61.1%) were in the posterior circulation. Average dome size was 10.2 mm (range, 3.7-19.8 mm) and average neck size was 5.36 mm (range, 3.0-10.0 mm). Six out of seven aneurysms of the anterior circulation were approached with parallel technique. Eight aneurysms of the posterior circulation were approached with sequential technique. Average number of coils deployed was 9.64 (range, 4-23 coils). Eleven aneurysms (64.8%) resulted in Class 1 and/or Class 2. One technical failure was observed. Technical complications were recognized in four patients (23.5%), all of them with unruptured aneurysms in the anterior circulation. Two patients (11.7%) presented transient immediate clinical complications. One patient (5.8%) had minor permanent neurological complication. Neither major clinical complications nor death were encountered. Favorable clinical outcome (Modified Rankin Scale score 0-2) was observed in 88.2% of the patients (average follow-up time, 4.72 months).Conclusion:Absence of major permanent complications and satisfactory immediate obliteration degree in our preliminary experience indicates that microstent-assisted coiling technique is useful for the minimally invasive treatment of broad-necked complex aneurysms that are not ideal for conventional endovascular treatment and are at a high risk for conventional surgical treatment.

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