Dermatofibrosarcoma protuberans and giant cell fibroblastoma exhibit CD99 positivity

According to most authors, dermatofibrosarcoma protuberans (DFSP) and giant cell fibroblastoma (GCF) represent the adult and juvenile forms, respectively, of the same disease entity, as evidenced by similar morphology, an identical chromosomal translocation, and CD34 positivity. It has been shown that DFSP and nuchal‐type fibroma (NTF) (which is also CD34‐positive) are related lesions, and that there might possibly be a continuum between the...