A kidney expanded and replaced by tumour tissue, apparently arising in the central area of the kidney
and extending through the cortex to present externally. At the hilum, one can see the tumour
protruding into the renal veins.
This man presented at the age of 72 with symptoms of prostatic obstruction. An intravenous
pyelogram showed a space-occupying lesion in the left kidney, which was subsequently removed.
Later investigation showed evidence of above secondary. This histology was that of a typical
carcinoma of the kidney.