Extrarenal Wilms' tumor of the uterus.

Wilms' tumor (nephroblastoma) is rare in adults. Its occurrence as a primary tumor outside the kidney is exceptional. Only 4 cases [1-4] have occurred in the uterus. This report adds the fifth instance of primary uterine Wilms' tumor. The patient, a 77-year-old woman (G2P2), is the oldest ever described with a Wilms' tumor.