Reports of spontaneous spinal chronic subdural hematoma (SDH) are extremely rare. In the limited cases reported, the
origin, symptoms and treatments are diversely revealed. Therefore accurate diagnoses and proper treatments are difficult
to determine. We report a 74-year-old male presented with severe low back pain and both buttocks pain. Magnetic
resonance imaging showed a diffuse subdural infiltrating mass compress nerve roots at the level of L2-S2. Emergency
operation for decompression and excision of mass revealed spinal chronic SDH. His pain was subsided after the operation.
We report a rare case of idiopathic lumbosacral spinal chronic SDH and discuss various causes and treatments.