A correct differential diagnosis of pelvic tumors is sophisticated in gynecology. The present effort concerns with introducing of computertomography in our diagnostic facilities. The ultrasound method being of value in detection of early developing ovarian tumors and showing their size as well as the extent of tissue transformation is however unprecise in comparison with CT-method which allows to evaluate the anatomical relations and tissue differences. The latter one allows differentiation of cystic tumor from dermoid cyst as well as from solid tumor. Density measurement scrutinizes with more precision endometriosis, lipomatosis and tubo-ovarial abscesses. The CT-diagnosis has been proving useful especially in differentiation between ovarian and intestinal tumors.