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After entering the thyroid follicle (or thyroid follicular cell) via a Na + /I − symporter (NIS) on the basolateral side, iodide is shuttled across the apical membrane into the colloid via pendrin after which thyroid peroxidase oxidizes iodide to atomic iodine (I) or iodinium (I +). The chemical reactions catalyzed by thyroid peroxidase occur ...
Follicular hyperplasia is one of the most common types of benign lymphadenopathies. [1] It can be typically found in children and young adults however all ages are subject to follicular hyperplasia, including the elderly. Lymphadenopathies such as follicular hyperplasia, are usually localized but can also be generalized and are non gender specific.
Non-hyperfunctioning adenomas with papillary hyperplasia usually show a more predominantly papillary pattern without vacuolated cytoplasm and scalloping colloid (b). Rare hyperfunctioning follicular tumors (c) can show capsular and/or venous invasion (inset); the nuclei are very clear which may be associated to hyperfunctioning.
Histopathology of NIFTP, H&E stain. [1]Noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP) is an indolent thyroid tumor that was previously classified as an encapsulated follicular variant of papillary thyroid carcinoma, [2] necessitating a new classification as it was recognized that encapsulated tumors without invasion have an indolent behavior, [2] and may ...
Thyroid follicular adenoma ranges in diameter from 3 cm on an average, but sometimes is larger (up to 10 cm) or smaller. The typical thyroid adenoma is solitary, spherical and encapsulated lesion that is well demarcated from the surrounding parenchyma. The color ranges from gray-white to red-brown, depending upon the cellularity of the adenoma
A follicular variant of papillary thyroid cancer also exists. [36] Newly reclassified variant: noninvasive follicular thyroid neoplasm with papillary-like nuclear features is considered an indolent tumor of limited biologic potential. Follicular thyroid cancer (10 to 20% of cases [35]) – occasionally
Papillary microcarcinoma is a subset of papillary thyroid cancer defined as measuring less than or equal to 1 cm. [15] The highest incidence of papillary thyroid microcarcinoma in an autopsy series was reported by Harach et al. in 1985, who found 36 of 101 consecutive autopsies to have an incidental microcarcinoma. [16]
The dermis is the layer of skin between the epidermis and subcutaneous tissue, and comprises two sections, the papillary dermis and the reticular dermis. [10] The superficial papillary dermis interdigitates with the overlying rete ridges of the epidermis, between which the two layers interact through the basement membrane zone. [10]