Classification of Tumors of Stomach

Tumors of stomach may be classified, based on histology, into:

1. Epithelial tumors:

a. Intraepithelial neoplasia -Adenoma

b. Carcinoma:
i. Adenocarcinoma:

• Diffuse type
• Intestinal type

ii. Papillary adenocarcinoma
iii. Tubular adenocarcinoma
iv. Mucinous adenocarcinoma
v. Signet-ring cell carcinoma
vi. Adenosquamous carcinoma
vii. Squamous cell carcinoma
viii. Small cell carcinoma
ix. Undifferentiated carcinoma
x. Others

c. Carcinoid tumor (Well differentiated endocrine neoplasm)

2. Non-Epithelial:

a. Leiomyoma
b. Schwannoma
c. Granular cell tumour
d. Leiomyosarcoma
e. Gastrointestinal Stromal tumour:

• Benign
• Uncertain malignant potential
• Malignant

f. Kaposi’s sarcoma
g. Malignant Lymphomas:

• Marginal zone B-cell lymphoma of MALT( Mucosal Associated Lymphoid Tissues)
• Mantle cell lymphoma
• Diffuse large B-cell lymphoma
• Others

h. Other tumors

i. Secondary tumors