KIDNEY - Renal Calculus

The kidney has been opened to display dilated calyces and pelvis obstructed by a stone, ovoid in shape, and approximately 3 cm. in length. The shape and appearance of the stone suggests that this is largely composed of calcium oxalate with a finely papillary surface. Two very much smaller stones can be seen to the left of the main stone. They have shifted from the pelvis during mounting. There is a reduction in thickness of the cortex and the outer surface shows numerous minute cysts, presumably of congenital origin.