Cervical ectropion (or cervical eversion) is a condition in which the central (endocervical) columnar epithelium protrudes out through the external os of the cervix and onto the vaginal portion of the cervix, undergoes squamous metaplasia, and transforms to stratified squamous epithelium. Although not an abnormality, it is indistinguishable from early cervical cancer; therefore, further diagnostic studies (e.g., Pap smear, biopsy) must be performed for a differential diagnosis.