Primary Ovarian Carcinoid associated with Mature Teratoma: A Rare Case Presentation

Abstract Background Carcinoid tumors are neuroendocrine tumors, which are usually observed in the lungs and gastrointestinal tract with rare occurrence within the gynecologic system. Ovarian carcinoids form 0.1% of ovarian neoplasms and 1% of all carcinoid tumors. Due to its rarity, it becomes paramount to report this case, to identify key points of morphology and discuss its clinical course and best treatment options. We report a case of primary ovarian carcinoid arising within a mature cystic teratoma diagnosed at a cancer referral centre in North India. Case A 63-year-old postmenopausal woman, presented with complaints of abdominal pain for 2 months. A 10 × 12 cm immobile, firm to hard and nontender mass was palpable in lower abdomen, 2 cm below umbilicus. USG performed showed 8 × 11 cm mass in the right adnexa with loss of fat plane with the uterus and moderate ascites. Staging laparotomy was performed. Histopathology revealed a tumor disposed in insular and organoid patterns with largely monomorphous tumor cells suggestive of carcinoid which was ratified by immunohistochemistry. A small focus showed a teratomatous component comprising of ecto, meso and endodermal components. Post surgery, the patient is doing well without any new symptoms post one year of follow-up. Conclusion Ovarian carcinoid is a relatively rare neoplasm and awareness of this entity is essential for identifying various treatment options.