A cancerous tumour that originates in the kidneys.
develops in the kidneys (also known as nephroblastoma). It is more common in children under 5 years of age and is quite different to adult kidney cancers. Prognosis will depend on stage and histology. The majority of patients present with tumour in one kidney, while some have tumour in both kidneys (bilateral). There are two histopathalogic groups; most patients have favourable histology while about 10% have unfavourable histology (anaplastic or sarcomatous).