Endometrial carcinoma is the 15th most common cancer, and cervical carcinoma is the 2nd most common cancer worldwide. Co-existence of cervical and endometrial cancer, however, is a rare occurrence. Collison tumor consists of two separate independent neoplasms which are in close proximity of each other and have a sharp clear boundary between them. Only a few such gynecological cases have been reported in the literature.

A 60-year-old female was initially diagnosed as carcinoma cervix on radiological and pathological (biopsy) investigations. Patient then underwent total hysterectomy, and histopathological examination demonstrated collision tumor consisting of endometrial adenocarcinoma and cervical squamous cell carcinoma. She then received radiation therapy at our institute.

Collision tumors, being rare, are difficult to diagnose radiologically, and only histopathological examination can confirm the diagnosis, and hence, continuous reporting of such cases will help in better analyzing and developing treatment protocols and thus improving patient outcomes.