Table 3.

Clinical staging system for mycosis fungoides and Sézary syndrome.²

Clinical staging	TNMB Classification
Ia	T1	N0	M0	B0 or B1
Ib	T2	N0	M0	B0 or B1
IIa	T1 or T2	N1 or N2	M0	B0 or B1
IIb	T3	N0 to N2	M0	B0 or B1
IIIa	T4	N0 to N2	M0	B0
IIIb	T4	N0 to N2	M0	B1
IVa1	T1 to T4	N0 to N2	M0	B2
IVa2	T1 to T4	N3	M0	B0 to B2
IVb	T1 to T4	N0 to N3	M1	B0 to B2

T, Skin; N, Lymph node; M, Viscera; B, Peripheral blood.