Colposcopic and pathologic features in two cases of DES-related vaginal clear-cell adenocarcinoma

Two cases of vaginal clear-cell adenocarcinoma occurred as a result of maternal ingestion of diethylstilbestrol during pregnancy. The first case was diagnosed during the patient's first office visit. The second patient was first seen by the authors in 1976 and was followed at six-month intervals during the ensuing six years; the adenocarcinoma developed during this interval. Colposcopy and cytology were important in the diagnosis of both cases.