Keloidal Kaposi sarcoma.A. Spindled cells from the edge of the Kaposi sarcoma plaque lesion (upper left) are flanked by an expanse of keloid-like collagen (lower right) (H&E stain). B. Masson's trichrome stain highlighting the keloidal collagen bundles. Note the many extravasated erythrocytes in the background.
Grayson and Pantanowitz Diagnostic Pathology 2008 3:31 doi:10.1186/1746-1596-3-31