Abstract
Two dwarfed kidneys with scattered foci of grayish-white lesions from a slaughtered head of Japanese Black cattle 59 months old were submitted to pathological examination. Masses of immature and abnormally shaped renal tubules were scattered throughout the cortices and medullae of both kidneys. Immature mesenchymal tissues and myxomatous tissues had proliferated in the tubulointerstitial tissues of the lesions. Some glomeruli were immature. These findings led to a diagnosis of renal dysplasia. The animal lived to be 59 months old because the dysplastic lesions were localized and all other renal tissues were practically normal.
