Mature cystic teratomas are the most common ovarian germ cell tumour and account for 10â??20% of all ovarian neoplasms. Malignant\ntransformation of mature cystic teratomas is rare and has an incidence rate of less than 1%. The most common malignancy are\nsquamous cell carcinomas. Here we present the case of an intestinal adenocarcinoma which is an exceedingly rare malignant entity\narising within a mature cystic teratoma. Clinical presentation, imaging and histopathological diagnosis are discussed and previously\npresented cases in the literature reviewed.
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