KIDNEY - Transitional cell carcinoma

The cut surface of the kidney shows a finely papillary tumour mass covering the whole of the exposed calyceal system in the upper pole; there is bloodclot present in the lower part. In the renal parenchyma there are a number of discreet white areas apparently confined to the medulla and not apparently within the cortex. In this particular specimen much of the spread within the kidney is due to intra-tubular invasion with peripheral spread and growth to produce the discreet nodules seen. A further possibility is that some of the spread is due to retrograde lymphatic permeation and to direct infiltration.