Extension of cervical intraepithelial neoplasia to the endometrium is a rare entity. In this study a seventy one year old patient with CIN 3 which replaced the endometrial tissue as squamous dysplasia is presented. This entity should be considered in the differential diagnosis of squamous epithelial lesions both in currettage and resection specimens of uterus. Though its prognostic significance is not briefly known, recognition of more cases might lead to understand its effects on the clinical course.