Borderline ovarian tumors are most commonly serous or mucinous and account for 1 to 15% of all epithelial tumors. These tumors are characterized by low malignant potential and are most often diagnosed when they reach a significant size, causing abdominal pain or distension of the abdomen. The gold standard in the diagnosis of ovarian tumors is a pathohistological finding obtained by the examination of tumor tissue that has been surgically removed. Female patient 73 years old, reported to the Emergency Medicine Clinic of the General Hospital in Cuprija, with severe abdominal pain, enlargement of the abdomen, constipation longer than 7 days and urinary incontinence, with the following diagnosis: Dolor abdominalis inferior, referred to Department of Gynecology. One week before her admission, because of suspicion of a bladder tumor, she was hospitalized at the urology department. A gynecological examination revealed that the abdominal wall was above the chest wall, and the tumor filled the small pelvis - a palpable mass of tumor above the navel. Additional diagnostic procedures confirmed the presence of tumors and subsequently underwent surgery. Surgery is a therapy for the treatment of ovarian tumors, and the form of surgical approach depends on the stage of the disease, the age of woman, the general condition, and the desire to preserve fertility. In the treatment of the patient whose case was presented, a radical surgical procedure was applied.