Staging of Feline Mammary Tumorsa

Stage

T

N

M

I

T1

N0

M0

II

T2

N0

M0

III

T1, T2

T3

N1

N0, N1

M0

M0

IV

Any T

Any N

M1

Abbreviations: M, distant metastasis; M0, no distant metastasis; M1, distant metastasis present; N, nodal involvement; N0, no nodal metastasis present; N1, nodal metastasis present; T, size of primary tumor; T1, tumor < 2 cm; T2, tumor 2–3 cm; T3, tumor > 3 cm.

a Adapted from the World Health Organization staging system.

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