Unusual variants of vaginal adenosis: a challenge for diagnosis and treatment.

Two unusual cases of vaginal adenosis in non-diethylstilbestrol (DES)-exposed patients are presented. These cases created an initial difficulty in histological classification and exclusion of the diagnosis of adenocarcinoma. The first case presented a problem of atypical columnar epithelium with simple gland architecture, while the second showed a pseudoinfiltrative pattern of small glands, but without cytological atypia. A diagnosis of glandular dysplasia (atypical columnar epithelium) was finally made in the first case and vaginal adenosis with unusual architectural features in the second. The first patient was treated by excision and the second expectantly. Subsquently, neither patient has developed carcinoma. The spectrum of glandular changes in vaginal adenosis appears analogous to that of the cervix. Until the natural history of sufficient numbers of these variants of vaginal adenosis have been studied, the analogous cervical condition may serve as a guide to prognosis. The diagnosis of invasive adenocarcinoma should be made cautiously unless there are both architectural and cytological features of malignancy.