Clinical experience in the treatment of retroperitoneal soft tissue sarcomas during period 1978-1987 is presented. The material consists of 64 patients with the male predominance (60.94%), and the peak occurrence in the forth and fifth decade of life. The difficulties in the diagnostic of these tumours are mostly caused by unspecific clinical picture, which is usually cleared with the stage of inoperability. Modern diagnostic approach, using echotomography and angiography enables earlier diagnosis. The most often seen histological pictures in this series are: M. Hodgkin (28.14%), Liposarcoma (25%) Lympho and fibrosarcoma (twice 12.5%), and the other forms are rarely encountered (1-3%). The operability is very low, and the radical operation is performed only in 16 cases (25.50%), and exploratory procedures are performed in 44 (68.75%). In the rest of cases a reduction of bulk mass of tumour was performed. The 5 year survival in the radically operated is present in 25% (4 patients) what is in accordance with the literature. In the cases with exploration or partial resection, the average survival is 4.5 months, in spite of some longer survivals in the group with Hodgkin's disease, mostly because of the modern cytostatic treatment. Intermediate postoperative mortality is 3.12% (2 patients). In recent years, the more aggressive surgical approach is advised, resulting in better outcome.