Thoracic root-related intradural extramedullary cavernoma presenting with subarachnoid hemorrhage: illustrative case

BACKGROUND

Just 5% of all cavernomas are located in the spine. Thoracic root-related subtypes are the rarest, with a total of 14 cases reported in the literature to date. Among them, only 4 presented with subarachnoid hemorrhage (SAH).

OBSERVATIONS

A 65-year-old female presented after an ictus of headache with no neurological deficits. Computed tomography (CT) demonstrated sulcal SAH, with the remainder of the workup nondiagnostic for etiology. Three weeks later, she re-presented with acute thoracic back pain and thoracic myelopathy. CT and magnetic resonance imaging suggested dubiously a T9-10 disc herniation with spinal cord compression. Surgical decompression and resection were then planned. Intraoperative ultrasound (IUS) demonstrated an intradural extramedullary lesion, confirmed to be cavernoma. Complete resection was achieved, and the patient was discharged a few days postoperatively to inpatient rehabilitation.

LESSONS

Although spine imaging is deemed to be low yield in the evaluation of cryptogenic SAH, algorithms can be revisited even in the absence of spine-related symptoms. Surgeons can be prepared to change the initial surgical plan, especially when preoperative imaging is unclear. IUS is a powerful tool to assess the thecal sac after its exposure and to help guide this decision, as in this rare entity.

Intradural Extramedullary Thoracic Cavernoma in a Man with Familial Multiple Cavernomas

Intradural extramedullary cavernomas are rare vascular malformations of the spine. Of the 40 previously described cases, four involved the upper thoracic spine and one was associated with familial multiple cavernoma syndrome. We report the case of a 55-year-old man with familial multiple cavernomas presenting with thoracic radiculopathy and back pain due to a T3-T4 intradural extramedullary cavernoma compressing the spinal cord and dorsal nerve rootlets. Vascular malformations of the thoracic spine are a rare cause of atypical chest pain that should be considered in an individual with familial multiple cavernoma syndrome.