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Table 2 Modified Ann Arbor (Musshoff) staging [25]

From: Gastric mucosa-associated lymphoid tissue lymphoma and Helicobacter pylori infection: a review of current diagnosis and management

Modified Ann Arbor system

Extension of organ involvement by lymphoma

I1E

Mucosa, submucosa involvement

I2E

Muscularis propria, serosa, neighboring organs

II1E

Regional abdominal lymph nodes (compartment I + II)

II2E

Intra-abdominal distant lymph nodes

IIIE

Extra-abdominal lymph nodes

IV

Diffuse or disseminated infiltration of distant or extra-gastrointestinal organs, bone marrow