Table 1.

Definition of the Modified Histological Grading Scale

Loss of bounds between NP and AF
0	Clear bounds
1	Limited loss of bounds
2	Substantial loss of bounds
3	Complete loss of bounds
Morphology of AF
0	Discrete and well‐arranged lamellae
1	Moderately serpentine with rupture
2	Severely serpentine with rupture
3	Clefts formed; fragmentation of lamellae
Presence and extent of fissures
0	No fissures
1	Fissures present within NP
2	Fissures extending to junction of NP and AF
3	Fissures extending to within AF
Cell cluster formation
0	No cell clusters
1	≤25% cells formed into clusters
2	25–75% cells formed into clusters
3	≥75% cells formed into clusters