To perform a systematic review of extracranial-to-intracranial (EC-IC) bypass surgery with parent vessel trapping for blood blister-like aneurysms (BBAs) of the internal carotid artery (ICA) according to PRISMA guidelines. Search of PubMed using "bypass" [all fields] and "ICA" [all fields] or "internal carotid artery" [all fields] and ("blood blister-like aneurysm" [MeSH terms]. Thirty-four original articles were identified, of which 21 were excluded (treatment not including bypass or insufficient details on complications or clinical outcomes). Thirteen articles published between 2008 and 2019 were included, totaling 98 patients, with a median of 7.5 patients per article (range 1-17). Mean age was 53.3 years (range 23-80). The main techniques were external carotid artery to middle cerebral artery (ECA-MCA) in 81% and superficial temporal artery to MCA (STA-MCA) in 19%. The most common grafts were radial artery (74%) and STA (19%). The risk of intraoperative rupture varied from 0 to 75%, with a mean of 12%. With respect to clinical outcomes, the modified Rankin Scale (mRS) was not stated in 30% of the cases. When stated, mRS was ≤ 2 in 79%, mRS was 3-5 in 10%, and 4% had mRS 6 (death). We identified only 13 articles, with no prospective studies. Outcomes were better than generally reported for ruptured aneurysms, both with respect to poor outcome (mRS > 2) and in-hospital mortality, perhaps reflecting a selection bias. In general, the data reporting quality was low, precluding any firm conclusions, but EC-IC bypass with ICA trapping may be a valid treatment option for ruptured ICA BBAs.

中文翻译：

---

EC-IC 旁路在 ICA 血疱动脉瘤中的作用——系统评价。

根据 PRISMA 指南，对使用载瘤血管捕获颈内动脉 (ICA) 血泡样动脉瘤 (BBA) 的颅外至颅内 (EC-IC) 搭桥手术进行系统评价。使用“bypass”[所有字段]和“ICA”[所有字段]或“颈内动脉”[所有字段]和（“血泡样动脉瘤”[MeSH术语]）搜索PubMed。确定了34篇原创文章，其中 21 篇被排除（治疗不包括旁路或并发症或临床结果的详细信息不足）。纳入了 2008 年至 2019 年间发表的 13 篇文章，共 98 名患者，每篇文章中位数为 7.5 名患者（范围 1-17）。平均年龄为 53.3 岁（范围 23-80）。主要技术是颈外动脉至大脑中动脉 (ECA-MCA) 占 81%，颞浅动脉至 MCA (STA-MCA) 占 19%。最常见的移植物是桡动脉 (74%) 和 STA (19%)。术中破裂的风险从 0% 到 75% 不等，平均为 12%。在临床结果方面，30% 的病例未说明改良的 Rankin 量表 (mRS)。当声明时，79% 的 mRS ≤ 2，10% 的 mRS 为 3-5，4% 的 mRS 为 6（死亡）。我们仅确定了 13 篇文章，没有前瞻性研究。破裂动脉瘤的结果优于一般报道的结果，无论是在较差的结果（mRS > 2）还是院内死亡率方面，这可能反映了选择偏倚。总的来说，数据报告质量低，无法得出任何确定的结论，