Clear cell tumors of the female genital tract.

Clear cell adenocarcinomas of the vagina, cervix, endometrium, and ovaries show very similar histological features. Several other tumors and tumor-like lesions of the female genital tract may also contain clear cells and may occasionally be misinterpreted as clear cell adenocarcinomas. These conditions include microglandular hyperplasia, mesonephric hyperplasia, Arias-Stella change, smooth muscle tumors containing clear cells, dysgerminoma, yolk sac tumor, metastatic renal cell carcinoma, steroid cell tumors, hepatoid carcinomas, signet-ring-cell stromal tumors, and trophoblastic tumors. This review discusses the histological features of all of these lesions, emphasizing the morphological aspects that are essential to accurate differential diagnosis.