Minimal |
Mucosa |
Minimal hyperplasia |
|
1 |
Mild |
Mucosa, sometimes extending into submucosa |
Mild hyperplasia, minimal goblet cell loss ± erosions |
|
2 |
Moderate |
Mucosa and submucosa |
Moderate hyperplasia ± few crypt abscesses, moderate goblet cell loss ± erosions |
|
3 |
Marked |
Mucosa and submucosa |
Marked hyperplasia ± several crypt abscesses and/or erosions |
± Irregular crypts or crypt loss ± ulcerations |
4 |
Marked |
Transmural |
Marked hyperplasia ± multiple crypt abscesses |
± Irregular crypts or crypt loss ± ulcerations |
5 |