A Case of Simultaneous Occurrence of the Two Most Common Benign Ovarian Tumours

Abstract

Ovarian tumors are a heterogeneous group of neoplasms that include epithelial, germ cell, sex cord, and stromal tumors. The most common benign ovarian tumors are serous and mucinous cystadenomas (epithelial origin) and mature teratomas (germ cell origin). Collision tumors are defined as the simultaneous occurrence of two histologically distinct neoplasms in the same organ.  We report a case of a 38-year-old woman presenting with right lower abdominal pain. Gynecological examination and 3D ultrasound revealed a large multilocular cystic mass in the right ovary.. Laparoscopic adnexectomy was performed, and histopathological examination identified three separate neoplasms: a serous cystadenoma of the fallopian tube, and both a mucinous cystadenoma and a mature cystic teratoma within the ovary. Collision tumors in the ovary are extremely rare and often undetectable with imaging alone. This case highlights the critical role of histopathological examination in achieving an accurate diagnosis.