Epithelial

• adenoma
  • tubular adenoma
  • villous adenoma
  • tubulovillous adenoma
• dysplasia
  • low grade dysplasia
  • high grade dysplasia
• serrated
  • sessile serrated adenoma
  • traditional serrated adenoma
• hamartoma
  • Cowden-associated polyp
  • Juvenile polyp
  • Peutz Jeghers polyp
• carcinoma
  • adenocarcinoma
    • cribriform comedo type adenocarcinoma
    • medullary carcinoma
    • micropapillary carcinoma
    • mucinous adenocarcinoma
    • serrated adenocarcinoma
    • signet ring carcinoma
  • adenosquamous carcinoma
  • spindle cell carcinoma
  • SCC
  • undifferentiated carcinoma
• neuroendocrine neoplasm
  • glucagon-like peptide producing neuroendocrine carcinoma

Mesenchymal

• lipoma
• leiomyoma
• GIST
• leiomyosarcoma
• angiosarcoma
• Kaposi sarcoma
• ganglioneuroma
• neurofibroma
• granular cell tumor
• perineurioma
• schwann cell hamartoma
• inflammatory fibroid polyp

Hematolymphoid

Metastasis