T-cell lymphoproliferative disorders are associated with a rich infiltrate of monocyte-derived cells. Normal skin and biopsies obtained from CTCL patients with mycosis fungoides (A) or lymph node biopsies from patients with PTCL (B) were stained for monocyte-derived macrophages (CD68) or dendritic cells (CD1a, CD11c, S-100). Representative examples (CTCL, n = 10; PTCL, n = 12) are shown (×200).