CD4 and primary cutaneous T-cell non-Hodgkin lymphoma: Cutaneous T-cell lymphomas (CTCL) represent a heterogeneous group of rare extranodal T-cell lymphoproliferative disorders (non-Hodgkin’s lymphomas, NHLs) which primarily affect the skin by a clonal accumulation of skin-homing CD4+CD45RO+ helper/memory neoplastic T-lymphocytes [1,2].