case_images: PMC11831980_01
case_images: A) The teratoma predominantly comprises benign thyroid tissue (hematoxylin and eosin stain, magnification 100x). B) Higher magnification shows a focal duct-like structure lined by ciliated epithelium (hematoxylin and eosin stain, magnification 400x). C) Another focus demonstrates mature glial tissue (hematoxylin and eosin stain, magnification 40x). D) The section depicts normal thyroid tissue on the right transitioning into papillary thyroid carcinoma on the left (hematoxylin and eosin stain, magnification 100x). E) A small focus of papillary projections with numerous crowded follicular structures, indicative of papillary thyroid carcinoma (hematoxylin and eosin stain, magnification 100x). F) High-power view shows crowded follicular structures with enlarged, optically clear nuclei that show occasional pseudoinclusions (arrows), features characteristic of papillary thyroid carcinoma (hematoxylin and eosin stain, magnification 400x). G) Immunohistochemical stain for TTF1 demonstrating strong, diffuse, nuclear staining in the crowded follicles (diaminobenzidine chromogen, magnification 400x). H) Immunohistochemical stain for PAX-8 showing a strong, diffuse, nuclear staining pattern in the crowded glands (diaminobenzidine chromogen, magnification 100x)
case_images: rjaf067f1.jpg
case_images: PMC11831980_01_rjaf067f1.jpg
case_images: f1
case_images: TTF1, 50% for CK7, and < 5% for Napsin-A. These findings confirmed PTC arising within SO (Fig. 1).