• Duoduo Zhang, Jinlu Yu, Yunbao Guo, Shujie Zhao, Guoguang Shao, and Haiyan Huang.
• Department of Surgery, First Hospital of Jilin University, 71 Xinmin Avenue, Changchun, 130021, China. 56773130@qq.com.
• World J Surg Oncol. 2015 Feb 12; 13: 37.

BackgroundIntracranial meningioma and glioma collision tumors are relatively uncommon and are even more rarely located within the ventricles.Case PresentationHere, we report a case of a patient with an intraventricular meningioma and astrocytoma collision tumor. A 39-year-old man previously underwent excision of an astrocytoma in the triangle area of the lateral ventricle and exhibited good post-surgery recovery. The astrocytoma recurred in situ six years after the surgery, and the case was complicated by a malignant meningioma. The patient recovered well after surgery to treat the recurrence and was administered radiotherapy after discharge. In addition to reporting on this case, we conducted a literature review of collision tumors; based on this review, we propose several hypotheses regarding the formation of collision tumors.ConclusionsWe conclude that a possible cause of the collision tumor formation between the intracranial meningioma and the astrocytoma was the recurrence of an astrocytoma-induced malignancy of the arachnoid cells in the choroid plexus.

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