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Washington University Experience | NEOPLASMS (HEMATOLYMPHOID) | ALK Fusion Histiocytosis | 1D ALK-positive Histiocytosis (Case 1) CD1a 40X 1
Unlike Langerhans Cell Histiocytosis which is defined by immunoreactivity for the histiocytic marker CD1a, Alk+ histiocytosis does not stain for the CD1a marker (CD1a IHC)
