A kidney bisected to show a rounded, brownish-coloured tumour mass occupying the medulla; the
overlying cortex is thinned. The tumour mass is some 3 cm. in diameter and appears to be
encapsulated. There is an area of haemorrhage in the pelvis; the ureter is normal. The capsular
surface shows an occasional small scar.
This man was admitted to hospital at the age of 73 with haematuria, among other lesions
and conditions. Investigations established the presence of a renal abnormality, which led to
nephrectomy and disclosure of the lesion shown above. The histology of the lesion is that of an
atypical renal adenoma.