Bone marrow involvement in mycosis fungoides demonstrated by needle biopsy

A bone marrow needle biopsy was performed in 19 patients with mycosis fungoides (MF). Two patients, one previously classified as stage 4 and the other with diffuse erythroderma had pathological bone marrow findings. Seventeen patients showed no evidence of bone marrow involvement, 10 of these were in the plaque stage. Bone marrow biopsy can be of value in assessing the stage of the disease.