The specimen has been cut in such a way that it is difficult to recognise kidney tissue, but there is some
present towards the lower pole. The kidney is greatly expanded by tumour with a rather nodular
pattern in which there are a number of areas of mucinous degeneration. The histology is that of a
rather poorly differentiated adenocarcinoma which is probably why the tumour does not have the
characteristic yellowish appearance of the more commonly seen carcinoma.