Giant ovarian cyst--an unusual finding

A 16 year old unmarried girl presented with complaints of abdominal distension,vomiting,constipation,difficulty in breathing and restlessness. on examination abdomen was grossly distended with fluid thrill. ultrasonographic examination revealed that there was a huge cystic collection with internal debris,multiple septations involving the whole abdomen and pelvis originating from right ovary. the left ovary was normal. her laparatomy was done. a giant ovarian cyst measuring 45 x 32 x 28 cm,which weighed 18 kg (almost 1/3 of whole body weight),was removed as such like a yoyo balloon. post-operative recovery was smooth. histopathological examination revealed that it was mucinous cystadenoma.