Figure 2: A: Cut section of the kidney showing all the calyces and pelvis infiltrated by SCC. The field change pattern of pelvicalyceal involvement is classically described for the urothelial malignancy; in SCC such involvement may occur but is extremely rare. B: Histopathological depiction of tumor cells. The malignant cells have completely replaced the pelvicalyceal urothelial architecture. Few intervening vessels are seen; normal renal architecture is obliterated. C: Microphotograph showing large malignant cells with intervening fi brous tissue as intervening sheets. At places, squamous tumor cells show keratinized deposition. The presence of keratin is pathognomonic of SCC.