Modified Ann Arbor system | Extension of organ involvement by lymphoma |
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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 |