RETROPERITONEAL LIPOSARCOMA
It is most common primary retroperitoneal tumor.
It rarely arises from lipoma.
It comprises 95% of all fatty retroperitoneal tumors.
Occurs between 40-60 years of age and is more common in males.
It is most radiosensitive sarcoma (32% 5-year survival).
CT Findings:
It is of mixed density (fat and soft tissue elements).
Shows contrast enhancement.
Pseudocystic pattern: water density secondary to volume averaging.
Angio: hypovascular; no vessel dilation, capillary staining, laking sites for liposarcoma.
Location:
- lower extremity 45%
- abdominal cavity and retroperitoneum 14%
- trunk 14%
- upper extremity 8%
- head and neck 7%