Although many cases of Diethylstilbestrol (DES)-associated clear cell adenocarcinoma (CCA) of the cervix and vagina have occurred, few have arisen in patients whose initial gynecologic evaluation has revealed only nonmalignant DES-related changes. We report a case of a 32-year-old lady who developed a stage II CCA after 8 years of thorough gynecologic examinations. This case substantiates the need for long-term gynecologic assessment in DES daughters.