PMC7086421_01
(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).
CRIOT2020-9127635.001.jpg
PMC7086421_01_CRIOT2020-9127635.001.jpg
fig1
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)).
PMC7086421_02
(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.
CRIOT2020-9127635.002.jpg
PMC7086421_02_CRIOT2020-9127635.002.jpg
fig2
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)).