Table 1 Grading system for the common bile duct tissue damage.
Grade | Epithelial hyperplasia | Mucinous gland hyperplasia | Lymphoplasmacytic infiltration | Neutrophil infiltration |
|---|---|---|---|---|
0 | Mucosa lined with a single layer of columnar epithelial cells | No significant mucinous gland hyperplasia | Spare lamina propria with occasional lymphocytes | None |
1 | Mild epithelial hyperplasia | Mild hyperplasia | Mild lymphoplasmacytic infiltration of lamina propria | Mild |
2 | Moderate epithelial hyperplasia | Moderate hyperplasia | Moderate lymphoplasmacytic infiltration of lamina propria | Moderate |
3 | Severe epithelial hyperplasia | Severe hyperplasia | Severe lymphoplasmacytic infiltration | Severe |
