This is a retrospective cohort with collection of tissues samples (FFPE or frozen), including female patients \>18-year-old treated in French between 2009 and 2016 for a thyroid carcinoma on struma ovarii. Clinical data and tissues will be centralized for assessment. One of the endpoint is the description of the population (such as baseline clinical and pathologist characteristics, first treatment, survival, treatment relapse) ; the other endpoint is the comparison between the genomic profile of the tumor tissues obtained in NGS and those of the thyroid carcinomas obtained from the TCGA.
