• Yihong Zhou, Xi Chu, Ye Yi, Liang Tong, and Yingbo Dai.
• Department of Urology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China.
• Medicine (Baltimore). 2017 Mar 1; 96 (11): e6373.

RationaleSolitary fibrous tumor (SFT) is a rare mesenchymal tumor occurs in various sites. Malignant SFT in retroperitoneum is extremely rare.Patient ConcernsWe report a case of malignant retroperitoneal SFT in a 59-year-old man presented with right flank pain for 1 month.Diagnoses, Interventions And OutcomesA laparotomy and resection of the tumor were performed, the histopathologic and immunohistochemical findings were consistent with malignant retroperitoneal SFT. No adjuvant treatment was performed, and the patient had no signs of recurrence or metastasis at the 12 months follow-up.LessonsComplete surgical excision is the basic treatment principle for malignant retroperitoneal SFT. The histologic features and the Ki-67 label index are helpful for the diagnosis of malignant SFT.

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