Objective: A case report of giant bilateral benign cystadenoma after vaginal delivery. Design: Case report. Settings: Department of Obstetrics and Gynaecology, University Hospital Ostrava. Subject of study: A 35-year-old woman twelve days after vaginal delivery was presented with symptoms of an acute abdomen. On ultrasonographic examination, the presence of a cyst filling the complete abdominal cavity. Bilateral cystic mass measuring 25x30 cm was removed by laparotomy. Subsequent histological examination revealed a benign mucinous cystadenoma. Conclusion: A case of giant mucinous cystadenoma is presented with clinical and pathological details. An ovarian cystadenoma was the cause of an acute abdomen in puerperium and led to clinical and therapeutic disconcerment.

        Key words: ovarian mucinous cystadenoma, puerperium