Spinal arteriovenous malformation.

The authors discuss a patient with a large (15 x 10 x 12 cm), bony soft tissue intradural arteriovenous malformation (AVM) who presented with a 20-year history of back pain. Plain radiographs revealed a destructive lesion. Magnetic resonance imaging showed serpentine vascular structures within the thecal sac and lytic bone lesions with multiple level involvement. A Craig needle biopsy by the referring physician, as well as an open biopsy by the authors, caused severe bleeding. There was no evidence of neoplasm. Selective spinal angiography demonstrated a metameric juvenile type AVM whose intradural component was fed by the artery of Adamkiewicz. Because the patient had no neurological deficit on presentation, the options of embolization and then surgery were considered too risky. The patient is being followed conservatively.