Table 1.

Histopathological scoring criteria

Grade	Glomeruli	Proximal/distal tubuli	Blood vessels
0	Normal	Normal	Normal
1	Microvacuolation	Microvacuolation	Focal dilation and blood stasis
2	Vacuolation	Vacuolation, ruffled border disappearance, cell shedding, rare casts	Diffuse dilation and blood stasis
3	Vacuolation, cell shedding, enlargement of Bowman capsule	Vacuolation, diffuse cell detachment, many casts	Diffuse, severe dilation and blood stasis, interstitial haemorrhage