A quite exhaustive molecular analysis of thyroid specific genes and oncogenes provided two interesting findings: the low PDS mRNA expression, which may explain the low hormonal production and the absence of thyrotoxicosis and the presence of a RET/PTC3 rearrangement, which prompts the possibility of a late malignant evolution..     ///    RET/PTC3 rearrangement and thyroid differentiation gene analysis in a struma ovarii fortuitously revealed by elevated serum thyroglobulin concentration..     ///    "Despite the absence of malignant features, the expression of RET/PTC3 rearrangement was found, raising the possibility of a potential malignant nature of the tumor. "