53 cases of ovarian tumors were diagnosed and operated in the Clinic of Obstetrics and Gynecology of Medical Academy in Bydgoszcz in years 1996-1997. Retrospective analysis of 58 results of ultrasonographic examination with color-Doppler estimated flows and histopathological diagnoses in cases of ovarian tumor was performed. On the ground of sonographically estimated morphology, presence or absence of vascularization and pulsation and resistance indices (PI and RI respectively) an attempt to discriminate benign and malignant tumors was made. Values of RI > 0.6 and PI > 1.0 in absence of morphologically suspicious features in ultrasonographic examination correlated with benign forms of ovarian tumors in histological examination.