This case report describes an extremely rare instance of a retroperitoneal mixed-type liposarcoma containing four distinct histologic subtypes.
May prompt broader histologic sampling in retroperitoneal masses; leaves open refined classification and management of mixed liposarcomas.
Mixed-type liposarcoma is a rare soft tissue tumor. This report describes a 50-year-old man with retroperitoneal mixed-type liposarcoma that consisted of four pathologically different components. Preoperative CT and MRI showed a giant retroperitoneal mass composed of several nodules with various attenuation and signal intensity. At laparotomy, the tumor appeared to be composed of four components. Pathologic examination revealed that each component was of a histologically different subtype. Mixed-type liposarcoma containing four different subtypes is extremely rare. Its clinical and pathologic features are briefly reviewed.
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Hosaka et al. (2008) studied this question.
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