Immunohistochemical features. The tumor showed focal, strong reactivity with HMB-45 (A), diffuse, strong nuclear reactivity with TFE3 (B), patchy moderate immunoreactivity with progesterone (C), and strong membranous positivity with CD117 (D). Pertinent negative stains included vimentin (E) and pan-cytokeratin (F).
Ritterhouse et al. Diagnostic Pathology 2014 9:81 doi:10.1186/1746-1596-9-81