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Liposarcoma is a cancer that arises in fat cells in soft tissue, such as that inside the thigh or in the retroperitoneum. It is a rare type of cancer that bears a resemblance to fat cells when examined under a microscope. It is typically a large, bulky tumor, and tends to have multiple smaller satellites that extend beyond the main confines of the tumor. Liposarcomas, like all sarcomas, are rare.

Patients usually note a deep-seated mass in their soft tissue. Only when the tumor is very large do ...