Wilms' tumour is the commonest malignant abdominal tumour in children. Unilateral multicentric, and bilateral Wilms' tumours are, however, less common, occurring in 7% and 5% of cases respectively. These are often associated with sporadic aniridia, genitourinary anomalies, hemihypertrophy and nephroblastomatosis. Nephroblastomatosis is a separate entity that may act as a precursor of Wilms' tumours. We present three cases of multiple Wilms' tumours. Two cases also had nephroblastomatosis which was not seen on pre-operative CT imaging but was identified in one case at MRI. In cases of multiple Wilms' tumours, MRI provides better delineation of the tumours and may, therefore, affect management.

Wilms' tumour; nephroblastomatosis; magnetic resonance imaging (MRI); computed tomography (CT); horseshoe kidney