Wilms' tumour, or nephroblastoma, is the commonest renal neoplasm found in children, but is rarely found in adults, the world literature recording only approximately 200 cases. Individual case reports continue to be published but only within the last 10 years have definitive treatment regimes been suggested. In order to determine the UK experience of adult Wilms' tumour, members of the British Association of Urological Surgeons were circulated with a questionnaire, and from 141 replies, 13 members reported 17 cases. Critical review of the original histology slides excluded 3 of these; the 14 remaining cases are described and their management discussed in the light of current recommended treatment.