Current view: leiomyosarcoma of the veins of the retroperitoneum. Case histories review

Leiomyosarcoma of the veins of the retroperitoneum - the rare malignant non-organ mesodermal formation, derived from the smooth-muscle tissue of the vessel wall. These slow-growing tumors with the delayed symptoms are often advanced. The leiomyosarcoma of the renal vein is the rarer oncological disease. The treatment of this condition is mainly surgical, often with the chemoradiation. In view of the rarity of these malignant diseases, the every case history review is very important for the science. There are two case history reports with the description of the diagnosis and treatment problems.