IDH2 and mesenchymal cell neoplasm: The study by Amary et al in the Journal of Pathology (2011) that states “IDH1 (isocitrate dehydrogenase 1) and IDH2 (isocitrate dehydrigenase 2) mutations are frequent events in central chondrosarcoma and central and periosteal chondromas but not in other mesenchymal tumors” stands out with 676 citations.