Systemic hemangiopericytoma (HPC) is a rare tumor, only accounting for 5% of soft tissue sarcomas. It can arise from anywhere with capillaries in the body, commonly seen in the lower limbs, retroperitoneum, or pelvis. Nine out of 24 cases of hemangiopericytoma occurred in the trunk and retroperitoneum as reported by O’Brien and Brasfield (1965), while 41/106 (Enzinger and Smith 1976), 22/60 (McMaster et al. 1975 b), or 5/20 (Felix et al. 1981) cases of hemangiopericytoma were reported to occur in the retroperitoneum.
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