Intracranial subdural hematoma after puncture of spinal meningeal cysts

A patient is reported with an intracranial subdural hematoma after puncture of spinal meningeal cysts. In this case, spinal meningeal cysts were diagn osed by myelography. No intracranial subdural hematoma was detected immedia tely after myelography. Deterioration in the patient's level of consciousne ss occurred after puncture of the cysts. The authors speculated that the ce rebrospinal fluid pressure dropped rapidly when the spinal meningeal cysts were punctured. This displaced the cerebral bridging veins downward, tearin g them and resulting in an intracranial subdural hematoma.