[Tumors of the retroperitoneum].

Authors present 13 patients with tumors of the retroperitoneal space. Primary tumors were revealed in 84.6%, malignant tumors in 92%, mesodermal source in 100%, liposarcomas in 30%, Operative treatment was undertaken in all patients, radical operation in 5 patients, radical operation with intervention on the surrounding structures in 4 patients, reduction tumor in one and biopsy in 3 patients.