Traumatic brain injury associated with an intradiploic epidermoid cyst: case report.

We present a case of an intradiploic epidermoid cyst with an unusual complication. After a minor fall, a patient with a large right parietal epidermoid suffered a traumatic brain injury caused by the transfer of the force of the fall through the cyst contents to the brain and by transdural herniation of the cyst contents into brain parenchyma. Elective resection of intradiploic epidermoids associated with large bony defects is recommended to avoid this apparently rare but potentially dangerous complication of an otherwise benign condition.