The kidney is approximately normal size, but there is a patchy reduction in cortical thickness and there
is quite extensive scarring with one small cyst apparent. The cut surface shows a dilated pelvis and
dilated calyces with a number of patches of sessile papillary tumour involving all areas; the lower end
of the ureter is also occupied by tumour. The dark staining in the lower calyx is blood and there
appears to be some infiltration of the kidney by tumour at this point. The histology is that of a
moderately well differentiated transitional cell carcinoma; in the apparently unaffected areas in the
pelvis the changes of in situ carcinoma are present and transitional cell carcinoma is present in the
lower part of the ureter.