title: Subdural Metastasis of Prostate Cancer.
abstract: Dural metastasis from prostate cancer is rare and may mimic a subdural hematoma (SDH). Preoperatively diagnosis may be difficult and only reveal its presence during surgery. We present such a case and review the literature to identify common characteristics. A 65-year-old man presented with headache, confusion, and progressive right upper limb weakness. Past history included a prostate adenocarcinoma with bone metastasis 3 years earlier. Head computed tomography (CT) scan without contrast revealed a multinodular bilateral hyperdense extra-axial lesion interpreted as acute SDH. At surgery planned for SDH drainage no blood was found; instead there was an en plaque subdural yellowish tumor. Histopathologic examination was consistent with metastatic adenocarcinoma of the prostate. We found 11 cases reported as dural metastasis of prostate cancer mimicking SDH. Surgery was performed on nine cases with no suspicion of dural metastasis. On preoperative nonenhanced CT scan images, three types of image patterns can be described: a nodule in SDH, multinodular metastasis surrounded by SDH, and large en plaque subdural tumor. The latter group consists of those cases where no blood but rather an en plaque subdural tumor was found at surgery. Even though rare, dural metastasis should be considered among the differential diagnoses in a patient known for prostate cancer.
authors.affiliation: Department of Surgery, Section of Neurosurgery, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, Canada.
authors.forename: Andre
authors.initials: A
authors.lastname: Nzokou
authors.affiliation: Department of Surgery, Section of Neurosurgery, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, Canada.
authors.forename: Elsa
authors.initials: E
authors.lastname: Magro
authors.affiliation: Department of Radiology, Section of Neurology, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, Canada.
authors.forename: François
authors.initials: F
authors.lastname: Guilbert
authors.affiliation: Department of Surgery, Section of Neurosurgery, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, Canada ; Department of Neurosurgery, Hôpital Cantonal, St. Gall, Switzerland.
authors.forename: Jean Yves
authors.initials: JY
authors.lastname: Fournier
authors.affiliation: Department of Surgery, Section of Neurosurgery, Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Quebec, Canada.
authors.forename: Michel W
authors.initials: MW
authors.lastname: Bojanowski
keywords: dural; metastasis; prostate cancer; subdural hematoma; surgical removal