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WHO classification of tumours of the stomach

Epithelial tumors

Premalignant lesions

Adenoma - ICD-O 8140/0
Intraepithelial neoplasia (dysplasia), low grade - ICD-O 8148/0
Intraepithelial neoplasia (dysplasia), high grade - ICD-O 8148/2

Carcinoma

Adenocarcinoma - ICD-O 8140/3

Papillary adenocarcinoma - ICD-O 8260/3
Tubular adenocarcinoma - ICD-O 8211/3
Mucinous adenocarcinoma - ICD-O 8480/3
Poorly cohesive carcinoma (including signet ring cell carcinoma and other variants) - 8490/3
Mixed adenocarcinoma - ICD-O 8255/3

Adenosquamous carcinoma - ICD-O 8560/3
Carcinoma with lymphoid stroma (medullary carcinoma) - ICD-O 8512/3
Hepatoid adenocarcinoma - ICD-O 8576/3
Squamous cell carcinoma - ICD-O 8070/3
Undifferentiated carcinoma - ICD-O 8020/3

Neuroendocrine neoplasms

Neuroendocrine tumor (NET)

NET G1 (carcinoid) - ICD-O 8240/3
NET G2 - ICD-O 8249/3

Neuroendocrine carcinoma (NEC) - ICD-O 8246/3

Large cell NEC - ICD-O 8013/3
Small cell NEC - ICD-O 8041/3

Mixed adenoneuroendocrine carcinoma - ICD-O 8244/3
EC cell, serotonin-producing NET - ICD-O 8241/3
Gastrin-producing NET (gastrinoma) - ICD-O 8153/3

Mesenchymal tumors

Glomus tumor - ICD-O 8711/0
Granular cell tumor - ICD-O 9580/0
Leiomyoma - ICD-O 8890/0
Plexiform fibromyxoma - ICD-O 8811/0
Schwannoma - ICD-O 9560/0
Inflammatory myofibroblastic tumor - ICD-O 8825/1
Gastrointestinal stromal tumor - ICD-O 8936/1

Benign (prognostic groups 1, 2, 3a) - ICD-O 8936/0
Uncertain malignant potential (group 4)- ICD-O 8936/1
Malignant (groups 3b, 5, 6a, 6b) - ICD-O 8936/3

Kaposi sarcoma - ICD-O 9140/3
Leiomyosarcoma - ICD-O 8890/3
Synovial sarcoma - ICD-O 9040/3

Malignant lymphomas

Diffuse large B-cell lymphoma - ICD-O 9680/3
Mantle cell lymphoma - ICD-O 9673/3
Marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) - ICD-O 9699/3

Secondary tumors