Figure 1: Macroscopic feature and Masson's trichrome staining of the left kidney 30 days postoperation. ( a , d , g ) The structures of the renal cortex and medulla were well preserved ( d , g ) in the nonatrophic kidney ( a ). ( b , e , h ) The atrophic kidney ( b ) showed diffuse interstitial fibrosis (green) and extensive renal tubular atrophy ( e , h ). Some tubules were dilated and filled with casts ( f ). ( c , f , i ) Though tissue outlines vaguely remained, the structures of the glomerulus and renal tubule disappeared ( f , i ) in the necrotic kidney ( c ). Calcium salt and lipofuscin deposits can be seen in necrotic tissue ( f ). Scale bar = 100 µm.