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Cervical dysplasia is the abnormal growth of cells on the surface of the cervix. Although this is not cancer, it is considered a precancerous condition.

Cervical dysplasia is grouped into three categories:

• CIN I -- mild dysplasia (only the lower one-third of cells in the upper layer of the cervix are abnormal)
• CIN II -- moderate to marked dysplasia (up to two-thirds of the layer contains abnormal cells)
• CIN III -- severe dysplasia to carcinoma in situ (precancerous cells are in the entire top layer of the cervix)

Cervical intraepithelial neoplasia (CIN); Precancerous changes of the cervix

Most cases of cervical dysplasia occur in women aged 25 to 35, although it can develop at any age.

While all causes of cervical dysplasia are not known, most cases of cervical cancer and severe dyplasia are caused by infection of the cervix with a persistent, high-risk strain of human papilloma virus (HPV).

The following may increase your risk of cervical dysplasia:

• Becoming sexually active before age 18
• Giving birth before age 16
• If your mother took a drug called diethylstilbestrol (DES) during pregnancy
• Multiple sexual partners
• Other illnesses or medications that suppress your immune system
• Persistent, high-risk HPV (genital warts) infection of the cervix
• Smoking

There are usually no symptoms.

A pelvic examination is usually normal.

A Pap smear shows abnormal cells. A colposcopy-directed biopsy is done to confirm the condition and determine its severity.

Other tests may be done to find out if the abnormal cells have spread outside the cervix. These include:

• Cone biopsy
• Endocervical curettage

Early diagnosis and prompt treatment cures nearly all cases of cervical dysplasia.

Without treatment, 30 - 50% of cases of severe cervical dysplasia may lead to invasive cancer. The risk of cancer is lower for mild dysplasia.

The condition may return.

Call for an appointment with your health care provider if you are a woman who has been sexually active for 3 years or you are age 21 or older and have never had a pelvic examination and Pap smear.

See: Physical exam frequency

To reduce the chance of developing cervical dysplasia:

• Don't smoke, as it increases your risk of developing more severe dysplasia and cancer if you do have an HPV infection
• Practice monogamy and use condoms during intercourse
• Wait until you are 18 or older before becoming sexually active

ACOG Practice Bulletin No. 99: management of abnormal cervical cytology and histology. Obstet Gynecol. 2008;112(6):1419-1444.

Committee on Adolescent Health Care: ACOG Working Group on Immunization. ACOG Committee Opinion No. 344: Human papillomavirus vaccination. Obstet Gynecol. 2006;108:699-705.

Noller KL. Intraepithelial neoplasia of the lower genital tract (cervix, vulva): etiology, screening, diagnostic techniques, management. In: Katz VL, Lentz GM, Lobo RA, Gershenson DM. Comprehensive Gynecology. 5th ed. Philadelphia, Pa: Mosby Elsevier; 2007:chap. 28.

Wright TC Jr, Massad LS, Dunton CJ, et al. American Society for Colposcopy and Cervical Pathology-sponsored Consensus Conference: 2006 consensus guidelines for the management of women with cervical intraepithelial neoplasia or adenocarcihnoma in situ. Am J Obstet Gynecol. 2007;197(4):340-345.

Wright TC Jr, Massad LS, Dunton CJ, et al. American Society for Colposcopy and Cervical Pathology-sponsored Consensus Conference: 2006 consensus guidelines for the management of women with abnormal cervical cancer screening tests. Am J Obstet Gynecol. 2007;197(4):346-355.