Chronic endocervicitis with scaling

In women of childbearing age, the columnar epithelium of the cervical canal moves outward toward the surface of the cervix due to estrogen. This part of the area that moves outward is called the transformation zone. The transformation zone is only covered by a single layer of columnar epithelium, which will gradually be replaced by squamous epithelium in the future. There are two main mechanisms for replacement: the first is squamous metaplasia, which is called squamous metaplasia here. The metaplastic squamous epithelium is different from the normal squamous epithelium of the cervical vagina and different from atypical hyperplasia. The second mechanism is squamous epithelialization, mature metaplastic squamous epithelium, relatively insensitive to carcinogen stimulation, but immature metaplastic squamous epithelium metabolism is active, under the stimulation of HPV virus, easy to make cervical epithelial cells heterotypic, and finally form CIN, that is, precancerous lesions.