On the right hand side of the specimen viewed from the front, there is a thin layer of
light-brown-coloured tissue which is all that remains of the kidney. The kidney has been replaced and
enlarged by partly necrotic partly haemorrhagic white tumour tissue in which, at the upper pole, a
cystic area can be seen.
This child presented at the age of 3 years with a 3-day history of abdominal pain, lethargy
and fever. Examination showed a mass in the left hypochondrium which was ultimately confirmed as
a renal tumour. The histology of the lesion is that of a Wilms' tumour (nephroblastoma); one lymph
node at the hilum of the kidney showed tumour infiltration.