Mature cystic teratoma or dermoid cyst is the most common germ cell tumour of the ovary. The incidence ranges from 5 to 25% of all ovarian neoplasms out of which 13.7% are bilateral. Teratomas usually occur in the ovaries but they may be seen in other sites known as extragonadal teratomas the incidence of which is only 0.4%. Teratomas are usually benign but they may turn out to be highly malignant. Torsion is known to be the most frequent complication of ovarian teratomas followed by

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... ion. Teratomas are classified as "Mature" and "Immature" by WHO. Teratomas show good prognosis specially the mature ones. Surgery and follow up remains the standard approach. We report a case of mature cystic teratoma in the right ovary of a 28 years old nulliparous woman.