Errors are described made in the course of diagnosis of "false" tumors of the uterine appendages of inflammatory genesis. An algorithm is developed of carrying out differential diagnosis between carcinoma of the ovary and "false" tumours of uterine appendages, involving ultrasonic investigation, computerized tomography and direct endolymphatic antibiotic therapy over a long period of time, which measures permitted a more accurate diagnosis to be made, an adequate surgical treatment to be instituted.