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Malignant transformation of ovarian dermoid cyst (mature cystic teratoma) is rare and most often established in postmenopausal women after surgery by sample anatomopathological analysis. We report the case of a 58-year-old woman showing abdominal pain associated with constipation episodes. The diagnosis of dermoid cyst was established upon ultrasonographic and tomodensitometric criteria. Its histopathological analysis confirmed the presence of a well differentiated epidermoid carcinoma. In line with the literature, our study highlights the importance of the age of the patient, the size of dermoid cyst and its growth rate as well as squamous cell carcinoma (SCC) antigen serum level. These date are collected in order to establish a correct diagnosis and provide an appropriate cure. When a cyst is discovered these data must pathological event, mostly observed in menopaused women. Certainty diagnosis is collected in order to establish a correct diagnosis and provide an appropriate cure. [Copyright &y& Elsevier]