The staging system for mycosis fungoides was devised by Bunn and Lamberg in 1979.2 

T indicates tumor; T1, patches or plaques over less than 10% of the body surface; T2, patches or plaques over more than 10% of the body surface; T3, more than one tumor; T4, erythroderma; N, lymph node; N0, no palpable lymphadenopathy or histological evidence of mycosis fungoides; N1, palpable node, no histological evidence of mycosis fungoides; N2, no palpable nodes, but histological evidence of mycosis fungoides; N3, palpable nodes and histological evidence of mycosis fungoides; M, metastasis; M0, no visceral involvement; M1, histologically confirmed visceral involvement.