Currently, according to the WHO classification, more than 50 morphological types of soft tissue sarcomas (STS) are distinguished, and the approaches of their treatment also differ [2-4]. This disease is equally common among men and women, more often at the age of 20-40 years. In 50% of patients, the disease affects limbs, in 40% – soft tissues of other parts of the body [1, 2, 6, 7].

The need for proper diagnostics and treatment of this disease, the frequency of diagnostic and therapeutic errors, indicate the importance of this problem [4-7].