KIDNEY - Adenoma

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.