[Wilms' tumor in adults]

4 rare cases are reported of adult Wilms' tumor in females aged 35-65. It had been developing subclinically for a long time and was detected at palpation or at abdominal ultrasonography. In the 35-year-old woman the weight of the removed tumor reached 3.5 kg. Wilms' tumor in the adults seems to run asymptomatically and, consequently, is likely to be diagnosed late.