Mucinous Cystadenocarcinoma Arising From a Mature Cystic Teratoma.

Mucinous cystadenocarcinoma arising from mature cystic teratoma is an uncommon entity. The possibilities are either due to malignant transformation of benign teratoma into adenocarcinoma or a collision tumor between a mature cystic teratoma and a mucinous tumor. Here we present a case of a woman with abdominal distension and vague abdominal pain. Ultrasound abdomen showed a huge heterogeneous space-occupying lesion extending from the pelvis to the epigastrium with non-visualisation of the ovary, suggesting an ovarian origin. Further characterisation by contrast-enhanced computed tomography confirmed a hemorrhagic abdominopelvic multiseptate cystic lesion along with massive ascites. After surgery, the histopathological examination revealed mucinous cystadenocarcinoma arising from the mature cystic teratoma.