Figure 1. Disease manifestations in mantled guereza with Kaposi sarcoma. A) Oligofocal flattened masses on the inner aspects of the lower lip. B) Multinodular fissured masses at the gingival margin. C) Fibrovascular stroma in the subepithelial propria of the lower lip with spindle cell proliferations delineating narrow vascular clefts and containing lymphoplasmacytic inflammatory cell infiltrates, hematoxylin and eosin stained; scale bar indicates 200 µm. D) Spindle cell proliferation with cavern formation in the perinodal adipose tissue of the mandibular lymph node; hematoxylin and eosin stained; scale bar indicates 100 µm. E) Immunohistochemical staining showing variable Ki67 expression in <20% of spindle cells, streptavidin-biotin complex method–diaminobenzidine tetrahydrochloride; scale bar indicates 100 µm. F) Immunohistochemical staining showing nuclear expression of latent nuclear antigen 1 in ≈50%–60% of spindle cells, streptavidin-biotin complex method–diaminobenzidine tetrahydrochloride; scale bar indicates 50 µm.