We reported a case of subdural effusion secondary to dural metastasis of prostatic cancer. A 54-year-old man was referred for headache, vomiting and gait disturbance. He had undergone hormonal therapy and docetaxel-based chemotherapy for prostatic cancer. The magnetic resonance imaging of the brain showed extensive leptomeningeal carcinomatosis and cranial dural metastases, and subdural hematoma. This is a very rare situation and bad prognosis.
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