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What are the imaging features of retroperitoneal liposarcoma?

→ Well differentiated liposarcomas are locally invasive.
→ Poorly differentiated liposarcomas are predominantly fatty masses.
→ Well differentiated liposarcomas contain large amounts of normal-appearing fat.
→ Well differentiated liposarcomas contain septa and nonadipose regions.
→ Retroperitoneal lipomas are more prevalent than liposarcomas.