Juxtacortical Chondroma, also known as periosteal chondroma, is related to chondroma and enchondroma, and has symptoms including pain An important gene associated with Juxtacortical Chondroma is IDH2 (Isocitrate Dehydrogenase (NADP(+)) 2), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. Affiliated tissues include spinal cord and bone.