Our hypothesis is STK11 adnexal tumour is a sex cord stromal tumour and may represent a dedifferentiated/poorly differentiated SCTAT is based on the fact that they share the same molecular aberration and that some cases of STK11 adenxal tumour are associated with SCTAT synchronously identified or seen in earlier or subsequent ovarian biopsies for the patient. This evidence concerns the gene STK11 and sex cord-stromal tumor.