| Benign epithelial tumors and precursors |
| Serrated dysplasia, low grade |
| Serrated dysplasia, high grade |
| Hyperplastic polyp, microvesicular type |
| Hyperplastic polyp, goblet cell |
| Adenomatous polyp, low-grade dysplasia |
| Adenomatous polyp, high-grade dysplasia |
| Tubular adenoma, low grade |
| Tubular adenoma, high grade |
| Villous adenoma, low grade |
| Villous adenoma, high grade |
| Tubulovillous adenoma, low grade |
| Tubulovillous adenoma, high grade |
| Advanced adenoma |
| Glandular intraepithelial neoplasia, low grade |
| Glandular intraepithelial neoplasia, high grade |
| Malignant epithelial tumors |
| Adenocarcinoma NOS |
| Serrated adenocarcinoma |
| Adenoma-like adenocarcinoma |
| Micropapillary adenocarcinoma |
| Mucinous adenocarcinoma |
| Poorly cohesive carcinoma |
| Signet ring cell carcinoma |
| Medullary adenocarcinoma |
| Adenosquamous carcinoma |
| Carcinoma, undifferentiated, NOS |
| Carcinoma with sarcomatoid component |
| Neuroendocrine tumor NOS |
| Neuroendocrine tumor, grade 1 |
| Neuroendocrine tumor, grade 2 |
| Neuroendocrine tumor, grade 3 |
| L cell tumor |
| Glucagon-like peptide-producing tumor |
| PP/PYY-producing tumor |
| Enterochromaffin cell carcinoid |
| Serotonin-producing tumor |
| Neuroendocrine carcinoma NOS |
| Large cell neuroendocrine carcinoma |
| Small cell neuroendocrine carcinoma |
| Mixed neuroendocrine-non-neuroendocrine neoplasm (MiNEN) |
