Spinal subdural haematoma: a rare complication of lumbar puncture. Case report and review of the literature.

The Authors describe a case of spinal subdural haematoma presenting as a cyst. It ist noted that cerebrospinal fluid parameters were normal, in contrast to what is usually found in similar cases; furthermore, no sensorimotor impairment was seen. Histological examination showed an organised haematoma; that explains why CT scan was not diagnostic in this case. Haematoma is probably due to the rupture of a vein localised between the dura mater layers.