A pathologist will look at the cells to ascertain if the development is benign (not most cancers) or malignant (cancer). There isn't any risk of unfold of tumor from an FNA. Figuring out the tumor type might help with deciding The obvious way to treat it. These tumors are scarce. https://www.sgvascularctr.com/understanding-benign-tumors-in-the-uterus-the-causes-risks-and-treatment-options-for-uterine-fibroids/