Nodular glomerulosclerosis
This is the lesion of Kimmelstiel-Wilson disease, one of the forms of diabetic glomerulosclerosis. Note the sclerotic
mesangial nodules in the glomerulus. Nodular mesangial lesions can occasionally occur in other glomerular disorders
such as membranoproliferative glomerulonephritis but this picture is almost pathognomonic of diabetes mellitus.