Acute interdural hematoma mimicking epidural hematoma: a case report.

Intracranial hematoma rarely presents between two dural layers of pachimeninges. Here, we present a case of an interdural hematoma with similar appearance to an epidural hematoma. A 51-year-old man presented with a left temporal contusion following a motor vehicle accident. After craniotomy and contusion removal, the post-operative CT scan showed a parietal intracranial hematoma located posterior and superior to the bone flap. The CT scan appearance of the new hematoma was similar to the CT scan appearance of an epidural hematoma. Upon operation, we determined that the hematoma was located between two layers of dura mater, i.e., an interdural hematoma. We removed the hematoma and sutured the two layers of dura to each other at multiple sites. Interdural hematoma is a rare entity. Its appearance in a CT scan can be mistaken for an extradural hematoma.