Papillary type thyroid carcinoma in an ovarian struma

Background Struma Ovarii are mature teratomas. In rare circumstances thyroid tissue is found as part of the histopathological makeup. Malignant transformation may occur in 1-2% of these rare cases. Aim To report a rare case of malignant thyroid carcinoma within a struma ovarii. Result A 22-year-old lady presented with a right pelvic mass. A right-sided laparoscopic salpingo-oophrectomy was performed which revealed a malignant struma ovarii neoplasm. A total thyroidectomy was performed with adjuvant I-131 therapy. Conclusion This is a rare tumour which necessitates surgical extirpation and removal of a normal thyroid gland to facilitate thyroglobulin monitoring.