AbstractBackground: Struma ovarii is a specialized monodermal teratoma, constituting 1-4% of benign ovarian teratoma. Composed predominantly of mature thyroid tissue of more than 50%.Based on histological features it can be classified into benign and malignant.The overall incidence of dermoid cyst is 20-25%. Case: A 28 year old multipara (G3P2L2) reported to VIMS labour room complex in active phase of labour at term gestation with hand prolapse with previous history of full term normal deliveries. Conclusion: Struma ovarii is a rare tumor of ovary. Diagnosis is made by histopathological findings.The optimal treatment for benign tumor is surgical resection i.e. either simple cystectomy or unilateral oophorectomy.Malignant cases need adjuvant treatment. Recurrence is uncommon.