Ruptured posterior spinal artery aneurysm: intraoperative and histologic findings with appreciable thrombosis.

Abstract

Little is known on the natural course of ruptured spinal artery aneurysm, and a treatment strategy remains to be elucidated. This case report aims to describe a rare case of a posterior spinal artery aneurysm that showed progressive thrombosis following subarachnoid hemorrhage. This is a case report and literature review. A 54-year-old man presented with subarachnoid hemorrhage due to posterior spinal artery aneurysm at the T10 level. The patient underwent surgery 19 days after onset. Most of the aneurysm appeared unenhanced on intraoperative indocyanine green video angiography, and total resection was performed. Histologic examination confirmed spontaneous thrombosis of the lesion. A review of the literature identified 19 cases of ruptured posterior spinal artery aneurysm. Thrombosed aneurysm and thrombosed parent artery were observed in 7 (44%) of the 16 cases treated with surgical or endovascular interventions. In the three cases treated conservatively, fatal rebleeding in the acute stage was noted in one case, whereas the lesion disappeared spontaneously in the chronic stage without rebleeding in two cases. Ruptured spinal artery aneurysms are prone to spontaneous thrombosis. The healing process of the lesion was well documented in the present case. Repeated angiographic follow-up offers a feasible alternative in the management of this fairly rare aneurysm.