Andreoli A, Calbucci F, Limoni P, Testa C
Surg Neurol. 1984 Oct;22(4):377-81. doi: 10.1016/0090-3019(84)90143-5.
A technically adequate four-vessel cerebral angiogram was normal on the first day after a typical episode of subarachnoid hemorrhage. The study was repeated 40 days later showing a large aneurysm of the basilar bifurcation. Hypothetically, the first attempt to visualize the aneurysm was negative due to early transitory thrombosis of the aneurysmal sac. In some cases of subarachnoid hemorrhage it is beneficial to repeat previously normal angiographic studies.
在典型蛛网膜下腔出血发作后的第一天，技术上足够的四血管脑血管造影显示正常。40天后重复该检查，发现基底动脉分叉处有一个大动脉瘤。据推测，首次观察动脉瘤呈阴性是由于动脉瘤囊早期短暂血栓形成。在一些蛛网膜下腔出血病例中，重复之前正常的血管造影检查是有益的。
