retroperitoneal liposarcoma

• most common primary retroperitoneal tumor
• rarely arises from lipoma
• 95% of all fatty retroperitoneal tumors

• 40-60 years; M>F
• most radiosensitive sarcoma (32% 5-year survival)

• CT
  • contrast enhancement
  • mixed density (fat and soft tissue elements)
  • pseudocystic pattern: water density secondary to volume averaging
• angio: hypovascular; no vessel dilation, capillary staining, laking

• lower extremity 45%
• abdominal cavity and retroperitoneum 14%
• trunk 14%
• upper extremity 8%
• head and neck 7%

© 2002, C.E. Kahn, Jr.
2002-04-18