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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