Image Description
Chordoma - Immunophenotype: Chordomas express brachyury, cytokeratin AE1/AE3, EMA, S100 protein, SOX9 and vimentin. CEA and GFAP are variably positive. With GFAP, reactivity is usually seen with polyclonal antibodies and less often with monoclonal antibodies. Poorly-differentiated chordomas show loss of SMARCB1/INI1 staining.