We report an unusual case of a 56-year-old woman with a supratentorial anaplastic ependymoma localized in the parenchyma without continuity with the ventricular system and brain surface. The patient presented with vertigo, and a calcified mass was detected in the left temporal parenchyma. Five years later, she had seizure of the right extremities. Computed tomographic scanning and magnetic resonance imaging revealed an enhanced mass with an intratumoral hemorrhage adjacent to the calcified mass. Subtotal removal of the tumor was performed. The histological analysis revealed that the tumor was an anaplastic ependymoma. After focal radiation therapy (50 Gy), the outcome was favorable, although the residual lesion was still seen on the images. Ependymomas usually arise from the cells lining the ventricular system and the central canal of the spinal cord. We discuss the summary of published cases of supratentorial ectopic ependymoma since the first case in 1995.
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