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Idiopathic interdural hematoma looking like a "Chinese dumpling"--case report.

A 79-year-old man presented with an interdural hematoma manifesting as headache. Computed tomography revealed a right parietal intracranial hematoma. Magnetic resonance imaging revealed the hematoma had divided the dura mater into two layers. Craniotomy was performed and a dural pouch containing a solid hematoma was totally removed. Histological examination showed the hematoma had divided the meningeal dura into two layers. This case confirms the location of interdural hematoma.