This is the eighth case report of a pediatric dissecting posterior inferior cerebellar artery aneurysm. The authors present the case of a 13-year-old boy who presented with posttraumatic posterior fossa subdural, subarachnoid, and intraventricular hemorrhage with hydrocephalus. Initial vascular imaging findings were negative; however, a high level of suspicion is necessary. The aneurysm was identified on day 20, after recurrence of hydrocephalus, and was treated with endovascular vessel sacrifice. The patient made a good recovery. It is important to consider arterial dissection in pediatric traumatic brain injury, especially with suspicious findings on initial CT scan and clinical presentation out of proportion to the mechanism of injury. Delayed vascular imaging is imperative for appropriate management.

这是小儿解剖小脑后下动脉瘤的第 8 例病例报告。作者介绍了一个 13 岁男孩的病例，他因外伤后颅窝硬膜下、蛛网膜下腔和脑室内出血伴脑积水就诊。最初的血管成像结果为阴性；然而，高度怀疑是必要的。在脑积水复发后第 20 天发现动脉瘤，并用血管内血管牺牲进行治疗。患者恢复良好。在小儿创伤性脑损伤中考虑动脉夹层很重要，特别是初始 CT 扫描和临床表现与损伤机制不成比例的可疑发现。延迟血管成像对于适当的管理是必不可少的。