Table 2. Scale for tissue sample pathology grading.

	Surface Appearance
Degree express	0	≤5%	5%≥	25%≥	50%≥	≥75%
Sign	−	±	+	++	+++	++++
Numeric	0	0.5	1	2	3	4
Description	None	Minimal	Mild	Altered	Moderate	Severe