• Hongzhou Duan, Kazuo Kitazawa, Takehiro Yako, Shunsuke Ichinose, Shigeaki Kobayashi, and Motohiro Sudo.
• Stroke and Brain Center, Aizawa Hospital, Honjo 2-5-1, Matsumoto, Japan; Department of Neurosurgery, Peking University First Hospital, Xicheng District, Beijing, China. Electronic address: duanhongzhou@126.com.
• World Neurosurg. 2016 Aug 1; 92: 580.e17-580.e21.

BackgroundGliosarcoma is a relatively rare and bimorphous brain tumor, predominantly located in the brain lobe. Here, we report a rare case of gliosarcoma presenting radiologically in the cerebellopontine angle (CPA) region.Case DescriptionThe patient was a 71-year-old woman with progressive tinnitus. A series of image examinations showed a rapidly growing CPA tumor, which enlarged from nonexistent to 4 cm in diameter with extension to the internal auditory canal in a short period of 6 months. The patient was operated on in emergency because of intratumoral hemorrhage and rapidly deteriorating neurologic symptoms. Under the diagnosis of gliosarcoma confirmed by pathologic examination, chemotherapy and radiotherapy were conducted after partial resection. The patient recovered uneventfully and the residual tumor disappeared nearly completely on the image taken 6 months later.ConclusionsAlthough rare, gliosarcoma should be considered in the differential diagnosis of CPA tumors, especially if it is associated with rapid tumor growth or intratumoral hemorrhage.Copyright © 2016 Elsevier Inc. All rights reserved.

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