Unruptured intracranial aneurysms

Between 3.6 and 6% of the population harbour an unruptured intracranial aneurysm. Risk of rupture is related to aneurysm site and size and whether or not the patient has already had a subarachnoid haemorrhage (SAH) from another aneurysm. In ISUIA 2, the rupture rate for anterior circulation aneurysms<7mm was 0% per year in patients with no prior SAH, and 0.3% per year in patients with previous SAH; 7-12mm aneurysms, 0.5% per year (both groups); 13-24mm aneurysms, 3% per year; and giant aneurysms 8% per year. Rupture rate for posterior circulation aneurysms is higher at all sizes:<7mm was 0.5% per year in subjects with no prior SAH, 0.7% in those with prior SAH; 7-12mm, 3% per year; 13-24mm, 3.7% per year; and giant aneurysms, 10% per year. Non-invasive tests like contrast enhanced magnetic resonance angiography (MRA) and multislice computed tomographic angiography (CTA) are alternatives to intra-arterial digital subtraction angiography (IADSA) to detect aneurysms. Although these are promising techniques, the quality of data testing their accuracy remains limited and single slice CTA and time-of-flight MRA are poorer at detecting aneurysms<5mm diameter, which account for up to 1/3 of unruptured aneurysms. For ruptured aneurysms, the only large scale randomised controlled trial comparing surgical and endovascular treatment (ISAT) by coiling, resulted in an absolute 8.8% reduction (updated figure as of June 2003 for 1888 patients) in death or dependency at 1 year compared with surgical clipping. For unruptured aneurysms, the best available data so far comparing coiling and clipping is from the prospective (but non-randomised) arm of ISUIA. Elective surgical clipping had combined morbidity and mortality at 1 year of 12.2% versus 9.5% for coiling, although the groups were not matched with more high risk patients in the endovascular treatment cohort. Nevertheless these data are encouraging for future randomised trials of elective coiling versus clipping for asymptomatic aneurysms, in particular as the unproven long-term durability of coiling treatment and the fact that complete aneurysm occlusion is not always achieved remain obstacles to its wider use in unruptured aneurysms. There is an increased risk of SAH in relatives of patients with SAH (highest in those with two or more first degree relatives affected), but most SAH is sporadic and therefore the balance of available evidence indicates that mass screening for aneurysms is not cost effective. There may be a limited role for investigation of high-risk subgroups and ideally such screening should be tested in a randomised trial. The avoidance and active management of vascular risk factors should also be part of the management of at risk subjects.     

Current update on the randomized controlled trials of intracranial aneurysms

Endovascular coiling has become the primary treatment modality for the treatment of intracranial ruptured aneurysms in many centers. A multicenter randomized controlled trial (RCT), ISAT study, has demonstrated that endovascular coiling of ruptured intracranial aneurysms has benefits over surgical clipping in those patients suitable for either treatment. Because RCT comparing conservative management with surgical clipping and with endovascular coiling have not been performed to date for unruptured intracranial aneurysms, the best management for unruptured aneurysm remains unclear. A RCT is ongoing to answer the question whether active treatment can improve the outcome of patients with unruptured intracranial aneurysms as compared with observation.     

动脉瘤外科治疗的临床研究

目的 比较开颅夹闭和介入治疗颅内动脉瘤的临床治疗效果. 方法 哈尔滨医科大学附属第二医院神经外科自2008年11月至2010年1月收治颅内动脉瘤患者73例,其中行开颅夹闭治疗30例,行介入治疗43例.回顾性分析2组患者的临床资料并比较并发症、住院时间和预后情况. 结果 脑水肿、脑梗死、颅内出血、脑积水和颅内感染的发生率2组间比较差异无统计学意义(P＞0.05);开颅夹闭组患者住院时间[(17.56±7.57)d]长于介入治疗组[(13.12±7.12)d],差异有统计学意义(P＜0.05);开颅夹闭组患者出院时预后良好25例,预后不良5例,介入治疗组患者出院时预后良好40例,预后不良3例,差异无统计学意义(P＞0.05). 结论 血管内介入治疗动脉瘤的安全性和有效性并不优于开颅夹闭治疗.     

Endovascular coiling versus neurosurgical clipping in patients with a ruptured basilar tip aneurysm

OBJECTIVES: To compare endovascular coiling with neurosurgical clipping of ruptured basilar bifurcation aneurysms. METHODS: Patient and aneurysm characteristics, procedural complications, and clinical and anatomical results were compared retrospectively in 44 coiled patients and 44 patients treated by clipping. The odds ratios for poor outcome (Glasgow outcome scale 1, 2, 3) adjusted for age, clinical condition, and aneurysm size were assessed by logistic regression analysis. RESULTS: In the endovascular group, five patients (11%) had a poor outcome v 13 (30%) in the surgical group; the adjusted odds ratio for poor outcome after coiling v clipping was 0.28 (95% confidence interval, 0.08 to 0.99). Procedural complications were more common in the surgical group. Optimal or suboptimal occlusion of the aneurysm immediately after coiling was achieved in 41 patients (93%). Clipping was successful in 40 patients (91%). CONCLUSIONS: The results suggest that embolisation with coils is the preferred treatment for patients with ruptured basilar bifurcation aneurysms.     

Surgical nuances of clipping after coiling: looking beyond the international subarachnoid aneurysm trial

After the introduction of Guglielmi Detachable Coils (GDC), endovascular management of ruptured and unruptured aneurysms became a viable alternative to surgical clipping as a "minimally invasive" option. Endovascular management of aneurysms became even more common after the International Subarachnoid Aneurysm Trial, which was one of the first prospective, randomized trials comparing clipping and coiling, showed reduced dependency and death in patients undergoing coiling after two months and one year. As the numbers of patients treated by endovascular therapy grow neurosurgeons are facing increasing challenges of clipping difficult aneurysms not suitable for coiling, including those that are wide-necked, thrombosed or involving many perforators. In addition, treatment failures (recurrent and residual aneurysms after coiling) pose difficult treatment scenarios fraught with complications due to surrounding adhesions, coil migration and involvement of adjacent neurovascular structures. Thus, we analyzed the recent literature dealing with the nuances of clipping after coiling and reviewed the current management principles involved in treating these difficult aneurysms.     

German Society of Neurosurgery Section on Vascular Neurosurgery: Position Statement on the International Subarachnoid Hemorrhage Trial (ISAT)

The outcome after a specific treatment (clipping or coiling) of ruptured intracranial aneurysms is determined by both the periprocedural complication rate and the success of preventing re-bleeding from the treated aneurysm. The latter is associated with a cumulative risk over many years, particularly in incompletely treated aneurysms. Incomplete occlusion of the aneurysm is not infrequently seen after endovascular coiling, even in cases with a perfect anatomical configuration. Therefore, we believe that the 1-year outcome as reported in the ISAT is not an appropriate endpoint for the comparison of both methods. There has also been a tendency to apply the 1-year ISAT data to all patients harbouring intracranial aneurysms. It is inappropriate and dangerous to be less critical when selecting the endovascular approach as the method of choice for treating an aneurysm. This will ultimately result in a higher complication rate of coiling. Another striking finding is the poor surgical outcome in the ISAT. This good-grade patient population (94 % were WFNS grade 1-3 and 89 % were WFNS grade 1-2) had an almost 10 % higher rate of poor outcome compared to other good-grade patients in large prospective surgical studies or the same outcome as trials that included up to 20 % poor-grade patients.[nl]Neurosurgeons should acknowledge that endovascular coiling is a safe method associated with less complications than clipping in experienced hands (Fig. ). Endovascular radiologists should acknowledge that the success of complete obliteration is higher after surgery, that incompletely occluded aneurysms have a higher rate of re-rupture and that the definitive long-term re-rupture rate still remains unknown. Therefore, we await with interest the angiographic and clinical follow-up data that will provide evidence about the final patient outcome.     

小脑前下动脉瘤11例临床分析

目的 总结小脑前下动脉瘤的临床和影像学特点，以及手术夹闭与介入治疗两种方法的治疗效果。 方法 回顾性分析首都医科大学附属北京天坛医院神经外科2012年1月-2019年12月收治的小脑前 下动脉瘤患者的基线信息、临床表现、动脉瘤特点、治疗方式和治疗效果。 结果 共收治11例小脑前下动脉瘤患者，其中显微外科手术夹闭动脉瘤5例，治愈率100%，术后2例 （40%）出现不完全性失语和手术侧面瘫，随访均无复发；介入治疗6例，5例（83.3%）完全栓塞动脉 瘤，其中2例（33.3%）闭塞动脉瘤远端载瘤动脉，1例（16.7%）栓塞治疗失败，术后1例（16.7%）出现 记忆力下降，1例（16.7%）出院1个月后动脉瘤破裂，并最终死亡。 结论 对于小脑前下动脉瘤，积极干预对于挽救患者生命意义重大，开颅手术夹闭和介入治疗都是 可选的治疗方式，两者均效果确切。     

比较手术夹闭和介入栓塞治疗颅内未破裂动脉瘤安全性和有效性的Meta分析

目的比较手术夹闭和介入栓塞治疗颅内未破裂动脉瘤的安全性和有效性。方法计算机检索1990至2018年颅内未破裂动脉瘤的所有临床对照研究。两名研究员分别纳入研究、提取数据、质量评价并应用Rev Man5. 0软件进行数据处理。结果最终纳入21篇文献,病例数109114例。Meta分析结果提示:手术夹闭组动脉瘤闭塞率为88. 2%,平均住院时间7. 7天,均高于介入栓塞组的65. 3%和4. 1天,P 0. 05。介入组患者的短期死亡率和致残率分别为0. 61%和2. 1%,均低于手术组的1. 27%和4. 7%,P 0. 05。介入组患者的1年期死亡率和致残率(2. 5%、2. 5%)均与手术组(2. 2%、1. 8%)无明显差异,P 0. 05。漏斗图未发现发表偏倚。敏感性分析结果一致。结论介入栓塞相比于手术夹闭可缩短患者的住院时间,降低患者的短期不良预后发生率。但是动脉瘤的闭塞率较低,1年期预后与手术夹闭无明显差异。据此推测手术夹闭患者的长期预后可能要好于介入栓塞,手术夹闭更适合于年轻患者。     

颅内破裂微小动脉瘤血管内治疗的安全性和有效性

目的探讨颅内破裂微小动脉瘤血管内治疗的安全性及有效性。方法回顾性分析2016年1月至2017年12月收治的53例颅内破裂微小动脉瘤的临床及随访资料,均采用血管内治疗。结果动脉瘤最大直径平均(2.19±0.55)mm。单纯弹簧圈栓塞27例,球囊辅助栓塞2例,支架辅助栓塞24例;术后即刻造影显示动脉瘤致密栓塞24例(45.3%),瘤颈残留16例(30.2%),瘤体显影13例(24.5%)。共3例(5.7%)发生围术期并发症,其中1例(1.9%)为术中破裂,1例(1.9%)为术中血栓形成,1例(1.9%)为术后早期再出血。39例影像学随访3·13个月,平均平均(6.1±2.4)个月,动脉瘤不显影32例(82.1%);稳定3例(7.7%);复发4例(10.3%),均再治疗。51例临床随访6~28个月,平均(14.9±6.6)个月,改良Rankin量表评分0~2分50例(98.0%),3分1例(2.0%)。结论对于颅内破裂微小动脉瘤,血管内治疗具有较高的围手术期安全性,以及较高的短期治愈率和临床预后良好率。     

Endovascular treatment of ruptured tiny (⩽3 mm) intracranial aneurysms in the setting of subarachnoid hemorrhage: A case series of 20 patients and literature review

Successful endovascular coiling of ruptured tiny saccular intracranial aneurysms (⩽3 mm) is technically challenging and traditionally has been associated with technical failures, as well as morbidity related to thromboembolic events and high intraoperative rupture rates. This study analyzes the feasibility, technical efficacy, and clinical outcomes of coil embolization of ruptured tiny intracranial aneurysms using current coil and microcatheter technology and techniques. We performed a retrospective review of 20 patients with 20 ruptured tiny aneurysms treated with endovascular coil embolization from 2013 to 2016 at a single high-volume academic tertiary care practice. The mean aneurysm size was 2.4 mm (median 2.5 mm, 1–3). Complete occlusion was achieved in 12 of 20 patients (60%), the remaining 7 of 20 patients (35%) had a small neck remnant, and there was 1 failure (5%) converted to microsurgical clipping. Two patients had a failed attempted surgical clip reconstruction and were subsequently coiled. There was 1 intraprocedural rupture (5%) and 1 severe parent artery vasospasm (5%) during coiling. At discharge, 60% of patients were living independently. At follow-up three patients were deceased. Mean angiographic follow-up was 139 days (SD 120). There were no aneurysm recurrences among occluded patients and there were no retreatments among those with neck remnants. Coiling of ruptured aneurysms ⩽3 mm is feasible with high occlusion rates and low complication rates. The availability of softer coils with flexible detachment zones has led to safe and effective endovascular treatment of tiny ruptured aneurysms.     

The impact of microsurgical clipping and endovascular coiling on the outcome of cerebral aneurysms in patients over 60 years of age

A retrospective study was performed to compare the safety and efficacy in elderly patients of endovascular coiling, with clipping, for cerebral aneurysms. In total, 198 patients over 60 years of age with ruptured intracranial aneurysms were treated by microsurgical clipping (n = 122) or endovascular coiling (n = 76). Endovascular coiling achieved favorable outcome in 88.2% of patients, which was significantly higher than for the microsurgical clipping group. The occurrence of re-bleeding, infarction, and hydrocephalus was similar between the two groups. Intraoperative time for microsurgical clipping was significantly longer than that for endovascular coiling. Length of hospitalization was shorter for the coiling group than for the clipping group. Our results suggest that endovascular coiling should be considered as the first-choice therapy in elderly patients with ruptured aneurysms, as it may reduce duration of both the operation and hospitalization.     

Clinical and Radiogical Outcomes of Endovascular Detachable Coil Embolization in Paraclinoid Aneurysms : A 10-Year Experience

Objective

Direct surgical clipping of paraclinoid aneurysms poses technical challenges to even very experienced neurosurgeons, making endovascular treatment an alternative treatment modality in many centers. We have therefore retrospectively evaluated the safety and efficacy of endovascular detachable coil embolization of paraclinoid aneurysms.

Methods

From June 1997 to June 2007, 65 patients underwent endovascular detachable coiling for 67 paraclinoid aneurysms (of which 9 were ruptured and 58 were unruptured) in our institute. Their medical records, radiological images and readings, and operation records were reviewed retrospectively.

Results

After the initial embolization procedure, complete occlusion was achieved in 29 (43.3%) of the aneurysms treated by endovascular detachable coiling. Six aneurysms required retreatment, with two each requiring one, two, or three additional endovascular procedures. Fifty-five (82.1%) aneurysms were measured by three-dimensional time of flight (TOF) magnetic resonance images (MRI) or transfemoral cerebral angiography (TFCA) at a mean follow-up of 29.7 months (range from 4 to 94 months), with 39 aneurysms (70.9%) showing complete occlusion. Thromboembolic events (3.8%) were the most frequent complication. Rupture did not occur during or after any of the procedures. According to the Glasgow Outcome Scale (GOS), 98.4% of the patients treated by coil embolization had a score of 4 or 5.

Conclusion

Our results indicate that endovascular detachable coiling is a safe and effective treatment modality in paraclinoid aneurysms.     

可脱性微弹簧圈血管内栓塞治疗颅内动脉瘤(附106例分析)

目的总结可脱性微弹簧圈血管内栓塞治疗颅内动脉瘤的经验。方法回顾性分析106例颅内动脉瘤行可脱性微弹簧圈囊内栓塞的经验。结果动脉瘤腔100%闭塞87例,95%闭塞11例,90%闭塞8例。95例破裂性动脉瘤病人术后GOS评分5分68例,4分10例,3分7例,2分4例,1分6例;11例未破裂性动脉瘤均达到临床治愈。本组病死率为5.7%。结论正确处理术中、术后并发症及提高栓塞技术是提高颅内动脉瘤治愈率的重要方法。     

颅内动脉瘤血管内栓塞治疗的临床分析

目的总结颅内动脉瘤血管内栓塞治疗技巧及结果。方法采用血管内栓塞治疗76例80个颅内动脉瘤。对23个宽颈动脉瘤采用瘤颈成形辅助技术栓塞治疗,其中球囊辅助成形术治疗动脉瘤4个,微导丝辅助瘤颈成形技术治疗5个,支架结合弹簧圈栓塞治疗14个。6个巨大动脉瘤5个用可脱性球囊闭塞载瘤动脉,1个用电解可脱性弹簧圈闭塞载瘤动脉。结果栓塞程度:致密栓塞48个(64.9%。48/74),90%以上栓塞11个(14.9%,11/74),疏松(90%以下)栓塞15个(20.3%,15/74)。术中动脉瘤破裂出血4例(5.3%,4/76),2例死亡。结论电解可脱性弹簧圈栓塞颅内动脉瘤具有微创、安全、效果可靠等优点。采用微导丝辅助瘤颈成形技术、瘤颈重塑形技术、血管内支架等方法,可以明显提高宽颈动脉瘤的致密栓塞率和减少脑梗死并发症发生。     

Direct costs of surgical clipping and endovascular coiling of unruptured intracranial aneurysms

BACKGROUND: Unruptured intracranial aneurysms can be preventively treated by surgical clipping or endovascular coiling. We determined in detail the costs of these treatments. METHODS: We included patients who were treated for an unruptured aneurysm between 1997 and 2003. Patients coiled in this period were matched with clipped patients according to the year of treatment, age and gender. Considering clipping and coiling, we compared all pre-admission costs of diagnostic procedures, all costs of treatment, and costs during follow-up including standard angiographic control examinations at 6 and 18 months after coiling. Costs were calculated as the product of the used resources and the costs of these resources. RESULTS: The mean price for clipping was EUR 8,865.42 and that for coiling EUR 10,370.29. The difference was mainly determined by the higher material costs of coiling (EUR 5,300) compared with clipping (EUR 690). Costs of clipping were mainly determined by the need for intensive care facilities (1.2 days after clipping and 0 days after coiling) and the length of hospital stay (10.5 days after clipping and 3.4 days after coiling). After bootstrapping the data, costs of coiling were on average EUR 1,553 (95% confidence interval: EUR 1,539-1,569) higher than those of clipping. CONCLUSIONS: For unruptured intracranial aneurysms, direct in-hospital costs of coiling are on average higher than those of clipping, mostly because of the more expensive coils.     

Ruptured intracranial aneurysms: the outcome of surgical treatment in experienced hands in the period prior to the advent of endovascular coiling

OBJECTIVES: To evaluate the results of treatment of patients with a ruptured intracranial aneurysm treated by a single experienced vascular neurosurgeon in the period prior to the introduction of endovascular coiling. METHODS: Over a mean (SD) period of 9 (2) years, between January 1990 and June 1999, 245 consecutive patients with ruptured intracranial aneurysms were treated. Patients' details were obtained from a database that had been constructed prospectively. The patients consisted of all those patients treated by the senior author (Mr Maurice-Williams) over this period-that is, every third day on call at his unit. During this period, all patients under the age of 75 years with a diagnosis of subarachnoid haemorrhage were admitted to the neurosurgical unit as soon as was practicable regardless of clinical grade. RESULTS: Of 245 patients, 190 (77.6%) underwent treatment by open surgery using standard microsurgical techniques. At 1 year, the mortality of the operated patients was 2.6%, while 89.5% of the patients had a Glasgow Outcome Score (GOS) of 4 and 5. The overall management outcome (all patients treated, including operated and non-operated cases) at 1 year was: 17.1 % dead while 74.3% had GOS 4 and 5. Of the 190 patients who underwent surgery, 38 (20%) required additional operations, totalling 72 operations in all. Of these, 32 were for hydrocephalus and 17 for the evacuation of intracranial haematomas/collections. Complications of surgery occurred in 56 patients (29.5%). CONCLUSION: Open surgery, despite good eventual results, is associated with a significant rate of re-operations and complications that would probably be largely avoided with endovascular treatment. Nevertheless, although endovascular coiling has these immediate advantages over surgery it is still not certain that the long term results will be superior to surgery which leads to permanent obliteration of the aneurysm. There may still be a need for open surgery in the future.     

Quality of life after treatment of unruptured intracranial aneurysms by neurosurgical clipping or by embolisation with coils. A prospective, observational study

BACKGROUND: Relatively high rates of complications occur after operation for unruptured intracranial aneurysms. Published data on endovascular treatment suggest lower rates of complications. We measured the impact of treatment of unruptured aneurysms by clipping or coiling on functional health, quality of life, and the level of anxiety and depression. METHODS: In three centres, we prospectively collected data on patients with an unruptured aneurysm who were treated by clipping or coiling. Treatment assignment was left to the discretion of the treating physicians. Before, 3 and 12 months after treatment, we used standardised questionnaires to assess functional health (Rankin Scale score), quality of life (SF-36, EuroQol), and the level of anxiety and depression (Hospital Anxiety and Depression Scale). RESULTS: Nineteen patients were treated by coiling and 32 by clipping. In the surgical group, 4 patients (12%) had a permanent complication; 36 of all 37 aneurysms (97%) were successfully clipped. Three months after operation, quality of life was worse than before operation; 12 months after operation, it had improved but had not completely returned to baseline levels. Scores for depression were higher than in the general population. In the endovascular group, no complications with permanent deficits occurred; 16 of 19 aneurysms (84%) were occluded by more than 90%. One patient died from rupture of the previously coiled aneurysm. In the others, quality of life after 3 months and after 1 year was similar to that before treatment. CONCLUSIONS: In the short term, operation of patients with an unruptured aneurysm has a considerable impact on functional health and quality of life. After 1 year, recovery occurs but it is incomplete. Coil embolisation does not affect functional health and quality of life.     

破裂颅内椎动脉动脉瘤的血管内介入治疗

目的 探讨血管内介入治疗在破裂颅内椎动脉夹层及梭形动脉瘤中的应用.方法 回顾性分析21例血管内介入治疗的颅内椎动脉夹层及梭形动脉瘤患者,其中8例采用微弹簧圈或球囊进行载瘤动脉闭塞术,13例应用支架辅助弹簧圈进行栓塞治疗.结果 8例载瘤动脉闭塞的患者,载瘤动脉完全闭塞,小脑后下动脉保持通畅;随访3-12个月,未遗留明显的神经功能障碍.13例支架辅助弹簧圈栓塞的患者,术中1例因再出血死亡;余12例中,致密栓塞10例,接近完全栓塞2例.9例患者(包括接近完全闭塞的2例患者)有效造影随访3-11个月,致密栓塞的患者中动脉瘤无复发,载瘤动脉及PICA保持通畅;接近完全闭塞的2例患者中有1例部分复发,给予再次致密栓塞,另1例达稳定状态;另3例电话随访,未发现遗留明显的神经功能障碍.结论 载瘤动脉闭塞术治疗破裂的椎动脉梭形及夹层动脉瘤效果肯定,但有潜在缺血的风险;支架辅助弹簧圈栓塞术近期效果较好,但远期疗效有待长期随访的验证.     

颅内破裂动脉瘤电解可脱性弹簧圈血管内早期栓塞治疗

目的 探讨早期电解可脱性弹簧罔血管内栓塞颅内破裂动脉瘤的临床疗效及应用价值. 方法 回顾性分析急诊用电解町脱性弹簧圈血管内栓塞治疗颅内破裂动脉瘤208例患者的临床资料. 结果 成功栓塞208例220个颅内动脉瘤.完全栓塞(>95%)128个,大部分栓塞(80%-95%)80个,部分栓塞(<79%)12个.并发动脉瘤破裂2例.1例痊愈,1例死亡;并发脑梗死5例,局部溶栓后遗留偏瘫和单瘫;3例弹簧圈末端遗留于动脉瘤外的载瘤动脉内.经抗凝治疗未发生并发症.12例复发再次栓塞后治愈. 结论 早期电解可脱性弹簧圈血管内栓塞治疗颅内破裂动脉瘤是一种较为安全、可靠、有效的治疗方法.     

CT血管造影指导颅内破裂动脉瘤超早期手术

目的研究单一依靠CT血管造影(CTA)资料,在超早期手术夹闭破裂颅内动脉瘤的可行性。方法从2004年6月至2007年2月,共有125例自发性蛛网膜下腔出血病人行CTA检查。其中有78例在出血后72h内完成CTA检查,并对57例患者单一依靠CTA资料急诊行超早期动脉瘤夹闭术。结果125例自发性蛛网膜下腔出血患者中,有78例在出血后72h内完成CTA检查,71例发现颅内动脉瘤,其中有57例行超早期开颅动脉瘤夹闭术。57例超早期开颅手术动脉瘤患者,多发动脉瘤4例,共61个动脉瘤,术中夹闭动脉瘤60个,动脉瘤包裹1个。CTA能很好地显示动脉瘤的大小、形态、同载瘤动脉及周边骨性结构的关系,为手术提供了足够的有用信息。结论容积重建成像CTA是一种可靠、无创的快速诊断颅内动脉瘤的方法,能为破裂动脉瘤的超早期夹闭手术提供详实的影像学资料,满足在急诊状况下开颅夹闭手术所需。