A peri-menopausal woman presented with abdominal distention, pelvic discomfort and problems of constipation for the last 4 months. All clinical and radiological examinations were in favor of a giant solid mass with cystic lesions arised from the left ovary. These findings raised suspicion of a primary malignant ovarian tumor or a preudomyxoma peritonei. Surgery revealed a giant mass arised from the uterine fundus. An abdominal hysterectomy with bilateral salpingo-oophorectomy and omentectomy were preformed. The histological examination verified a degenerated myoma with cystic lesions with no evidence of malignancy. The patient made an uneventful recovery. A gynecologist should always be prepared to perform a different surgery than planned according to operational findings (Fig. 2, Ref. 11).