Table 1.

Brunt System for Grading and Staging of Steatohepatitis (34)

Grade of steatohepatitis					Staging Fibrosis
Grade	Steatosis	Ballooning	Lobular Inflam.	Portal Inflam.	Stage	Fibrosis
Mild	Involves up to 2/3rds	Occasional, zone 3	Scattered, mild acute and chronic	None or mild	0	None
Moderate	Any degree	Obvious, zone 3	Mild, associated with ballooning	Mild to moderate	1	Zone 3 perisinusoidal fibrosis only
Severe	Typically more than 2/3rds	Marked, mainly zone 3	Mild to moderate	Mild to moderate	2	Zone 3 perisinusoidal fibrosis and periportal fibrosis
					3	Bridging fibrosis
					4	Cirrhosis