{"paper_id":"e8c3311f-9a59-4b4f-8c05-edb5a87b834c","body_text":"A Very Rare Case of Ovarian Collision Tumor with Contralateral Endometriotic Cyst: Fertility-Sparing Surgical Management\nAuthors/Creators\n- 1. Oasis Fertility, Vijayawada, Andhra Pradesh, India\n- 2. Ravi Hospital, Vijayawada, Andhra Pradesh, India\n- 3. Alluri Sitarama Raju Academy of Medical Sciences, Malkapuram, Andhra Pradesh, India\n- 4. Anuhya Diagnostics, Vijayawada, Andhra Pradesh. India\nDescription\nAbstract\nOvarian collision tumors are rare entities where two histologically distinct neoplasms coexist in the same ovary without interaction, often mimicking malignancy. Fertility-sparing surgery is crucial in young women. We present a unique case of a 25-year-old woman with progressive abdominal distension. Imaging revealed a large complex mass. Laparoscopic fertility-preserving surgery uncovered a 30 cm serous cystadenoma and a 5-7 cm mature cystic teratoma in the right ovary, along with a 4x5 cm endometriotic cyst in the contralateral ovary. A total of 12.5 litres of f luid was aspirated. Histopathology confirmed a collision tumor. Postoperatively, the patient experienced transient difficulty walking due to a sudden 12 kg weight loss but recovered fully with preserved ovarian function. This is the first reported case of a unilateral ovarian collision tumor with a contralateral endometriotic cyst. The case emphasizes the importance of considering collision tumors in differential diagnoses and the efficacy of laparoscopic fertility-sparing approaches.\nFiles\nwjog.2026.a3105.pdf\nFiles\n(365.6 kB)\n| Name | Size | Download all |\n|---|---|---|\n|\nmd5:15f7ecc9b3e96db4c0f51a0ad7da8da4\n|\n365.6 kB | Preview Download |\nAdditional details\nIdentifiers\nDates\n- Submitted\n-\n2026-01-07\n- Accepted\n-\n2026-01-29\n- Available\n-\n2026-01-31","source_license":"CC0","license_restricted":false}