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| ==Classification== | | ==Classification== |
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| === World Health Organization histological classification of gastric tumors: ===
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| {| class="wikitable"
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| !Types
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| !Histological features
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| |-
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| |'''Epithelial tumors'''
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| * '''Adenoma'''
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| * '''Carcinoma'''
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| * Adenocarcinoma
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| * Intestinal type
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| * Diffuse type
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| * Papillary adenocarcinoma
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| * Tubular adenocarcinoma
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| * Mucinous adenocarcinoma
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| * Signet-ring cell carcinoma
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| * Adenosquamous carcinoma
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| * Squamous cell carcinoma
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| * Small cell carcinoma
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| * Undifferentiated carcinoma
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| * '''Carcinoid (well differentiated endocrine neoplasm)'''
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| |-
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| |'''Non-epithelial tumors'''
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| |Leiomyoma
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| Schwannoma
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| Granular cell tumour
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| Glomus tumour
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| Leiomyosarcoma
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| GI stromal tumour
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| Benign
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| Uncertain malignant potential
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| Malignant
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| Kaposi sarcoma
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| |-
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| |'''Malignant lymphomas'''
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| |Marginal zone B-cell lymphoma of MALT-type
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| Mantle cell lymphoma
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| Diffuse large B-cell lymphoma
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| |}
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| === Japanese histological classification of gastric tumors: ===
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| {| class="wikitable"
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| !
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| !
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| |-
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| ===== Benign epithelial tumor =====
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| Adenoma
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| ===== Malignant epithelial tumor =====
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| '''Common type'''
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| Papillary adenocarcinoma
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| Tubular adenocarcinoma
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| Well-differentiated
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| Moderately differentiated
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| Poorly differentiated adenocarcinoma
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| Solid type
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| Non-solid type
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| Signet-ring cell carcinoma
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| Mucinous adenocarcinoma
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| |-
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| |Special types
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| |Carcinoid tumor
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| Endocrine carcinoma
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| Carcinoma with lymphoid stroma
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| Hepatoid adenocarcinoma
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| Adenosquamous carcinoma
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| Squamous cell carcinoma
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| Undifferentiated carcinoma
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| |-
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| |Miscellaneous carcinoma
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| |Non-epithelial tumor
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| Gastrointestinal stromal tumor (GIST)
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| Smooth muscle tumor
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| Neurogenic tumor
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| Miscellaneous non-epithelial tumors
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| Lymphoma
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| B-cell lymphoma
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| MALT (mucosa-associated lymphoid tissue) lymphoma
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| Follicular lymphoma
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| Mantle cell lymphoma
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| Diffuse large B-cell lymphoma
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| Other B-cell lymphomas
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| T-cell lymphoma
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| Other lymphomas
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| Metastatic tumor
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| Tumor-like lesion
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| Hyperplastic polyp
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| Fundic gland polyp
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| Heterotopic submucosal gland
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| Heterotopic pancreas
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| Inflammatory fibroid polyp
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| Gastrointestinal polyposis
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| Familial polyposis coli, Peutz–Jeghers syndrome
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| |}
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| ==References== | | ==References== |
| {{Reflist|2}} | | {{Reflist|2}} |
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| [[Category:Disease]]
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| [[Category:Types of cancer]]
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| [[Category:Conditions diagnosed by stool test]]
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| [[Category:Primary care]]
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| {{WH}} | | {{WH}} |
| {{WS}} | | {{WS}} |