Non-alcoholic fatty liver disease: An expanded review

Table 1 Non-alcoholic fatty liver disease activity scoring system[121]

Steatosis, grade (0-3)
< 5%	0
5%-33%	1
34%-66%	2
> 66%	3
Lobular inflammation
No foci	0
< 2 foci per 200 × field	1
2-4 foci per 200 × field	2
> 4 foci per 200 × field	3
Hepatocyte ballooning
None	0
Few balloon cells	1
Many cells/prominent ballooning	2
Fibrosis stage
None	0
Perisinusoidal or periportal	1
Mild, zone 3, perisinusoidal	1A
Moderate, zone 3, perisinusoidal	1B
Portal/periportal	1C
Perisinusoidal and portal/periportal	2
Bridging fibrosis	3
Cirrhosis	4