stage I

Definition of stage I mycosis fungoides
National Cancer Institute

stage I mycosis fungoides

(... my-KOH-sis fun-GOY-deez)
Stage I is divided into stages IA and IB. In stage IA, patches, papules, and/or plaques cover less than 10% of the skin surface. In stage IB, patches, papules, and/or plaques cover 10% or more of the skin surface. In both stages, there may be a low number of Sezary cells in the blood.

Source: NCI Dictionary of Cancer Terms