TNM Staging of Gastric Mucosa-Associated Lymphoid Tissue (MALT) Lymphoma

TNM Group

Designation

Description

T

T1

normal appearing, erythema, erosions, nodules < 0.3 cm, ulcers < 1.0 cm, tumor limited to mucosa and submucosa

T2

induration, nodules >= 0.3 cm and < 5 cm, ulcers >= 1.0 cm, tumor extending to muscularis propria

T3

mass >= 5 cm, with tumor extending to serosa

T4

mass >= 5 cm, with direct invasion into adjacent organs

N

N0

no lymph node involvement

N1

perigastric lymph node involvement

N2

regional lymph node involvement

N3

lymph nodes on both sides of the diaphragm

M

M0

no distant metastases

M1

bone marrow involvement, other visceral involvement, second extranodal site

TNM Stage

Ann Arbor Stage

any T, N0M0

I

any T, N1M0

any T, N2M0

II

any T, N3M0

III

any T, any N, M1

IV