case_images: PMC7086421_01
case_images: (a) Parathyroid adenoma with a rim of compressed normal parathyroid gland (H&E, x100). (b) Parathyroid adenoma showing proliferation of chief cells with intervening blood vessels. No adipose tissue is seen (H&E, x100). (c) Parathyroid adenoma with ectopic thymic tissue in the adjacent adipose tissue (H&E, x100). Inset: higher magnification to show Hassel's corpuscle. (d) Parathyroid microcysts adjacent to the parathyroid adenoma (H&E, x400). The cysts are lined by flattened to stratified lining epithelium (H&E, x400).
case_images: CRIOT2020-9127635.001.jpg
case_images: PMC7086421_01_CRIOT2020-9127635.001.jpg
case_images: fig1
case_images: Scant normal parathyroid tissue was seen compressed at one edge (Figure 1(a)). Focal areas showed follicles and areas of hemorrhage (Figure 1(b)). The adjacent adipose tissue showed foci of ectopic thymic tissue comprising of lymphoid aggregates with interspersed Hassel's corpuscles (Figure 1(c)). The cysts were lined by single to stratified cuboidal epithelium (Figure 1(d)).
case_images: PMC7086421_02
case_images: (a) FNA smears show papillae with and without vascular cores, multinucleate giant cells, monolayered sheets, and cells with well-defined cytoplasm (MGG). (b) FNA smears show chewing-gum colloid, intranuclear cytoplasmic inclusions, epithelial swirls, and cells with metaplastic cytoplasm (MGG). (c) Papillary thyroid carcinoma (classical) with thin arborizing papillae (H&E, x40). Inset: enlarged oval, overlapping, hypochromatic nuclei. Pseudoinclusions and nuclear grooves are seen (H&E, x400). (d) Inferior parathyroid gland with ectopic thymic tissue in the adjacent adipose tissue (H&E, x100). Inset: higher magnification to show Hassel's corpuscle.
case_images: CRIOT2020-9127635.002.jpg
case_images: PMC7086421_02_CRIOT2020-9127635.002.jpg
case_images: fig2
case_images: Epithelial swirls, chewing-gum colloid, and many cells with intranuclear cytoplasmic inclusions were noted (Figures 2(a) and 2(b)). Some showed nuclear grooves and pseudoinclusions (Figure 2(c)). In one of the sections, parathyroid tissue was seen, and in the adjacent adipose tissue, foci of ectopic thymic tissue comprising of Hassel's corpuscles in a lymphoid background was noted (Figure 2(d)).