A c.394C>T (p.Arg132Cys) mutation (Table 1) of the IDH1 gene was detected in both the ovarian JGCTs and enchondromatosis but not detected in the peripheral blood, skin tissue, muscle tissue, and oral mucosa samples of the patient, nor in the peripheral blood of the parents of the patient (Figure 7). This evidence concerns the gene IDH1 and Enchondromatosis.