[Retroperitoneal liposarcoma. Two cases].

Concerning two cases of liposarcomas developing in the retroperitoneal space, the characteristics of these rare tumors are reviewed. They are the most frequent mesenchymal tumors. Often, they are uncovered by palpable abdominal mass or when they compress adjoining organs. Computed tomography has proved valuable in the diagnosis of these lesions. Surgical removal is the treatment of choice. Recurrences are frequent and prognosis is poor.