A case of indeterminate cell histiocytosis with ETV3-NCOA2 translocation.

Indeterminate cell histiocytosis (ICH) is a rare histiocytic disorder characterized by a proliferation of CD1a and CD207/langerin cells. Recent molecular analyses have identified ETV3-NCOA2 translocation as a possible aetiopathogenesis of ICH. Herein, we describe the first Japanese case of ICH with ETV3-NCOA2 translocation.