The oncologic-gynecology practice shows that vein thrombophlebitis of the pelvis minor causes retroperitonal spreading of malignant tumor of the cervix or growth of the ovarian neoplasm. In cases of unexplained etiology, the existance of malignant tumors as an etiologic factor, should be excluded by the examination performed by an experienced gyneocologist-oncologist, by ultrasonography, computerized tomography and in case of doubt by explorative laparotomy.