Dorsal subdural hemorrhage from ruptured thoracic radicular artery pseudoaneurysm. case report and surgical video.

Radiculomedullary artery malformations are rare conditions: their rupture usually manifests with subarachnoid hemorrhage. To the best of our knowledge no cases of subdural bleeding have been described in the literature. We present the rare case of a 74 year old woman admitted to our Institute with sudden onset of right lower limb motor deficit and hypoesthesia, with no history of trauma: Magnetic Resonance Imaging of the dorsal spine was performed and a subdural hematoma was detected; subsequent dorsal laminectomy for hematoma evacuation was carried out. As the source of bleeding was not recognized, Digital Subtraction Angiography (DSA) was performed: a new leak of contrast agent from a dilation of a spinal radicular artery at the level of T5 was detected; XperCT imaging (an angiographic acquisition of Computed Tomography-like images) confirmed a new acute subdural bleeding. Urgent repeat surgery was considered the best option to identify and close the malformation. Postoperative DSA confirmed complete exclusion of the radicular artery malformation. This is the first report that describes, with an intraoperative video, a case of radiculomedullary artery pseudoaneurysm, responsible of an acute subdural bleeding and associated neurological deficit.