| light cells of thyroid | Cell's present between follicles or interspersed among follicular cell's; they are rich in mitochondria and are believed to be the source of thyrocalcitonin. Synonym: C cell, light cells of thyroid. (05 Mar 2000) |
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| lobes of thyroid gland | The two major divisions of the gland lying on the right and left side of the trachea and connected by the isthmus. A smaller pyramidal lobe is frequently present as an upward extension from the isthmus. Synonym: lobi glandulae thyroideae. (05 Mar 2000) |
| lobules of thyroid gland | The subdivisions of the lobes, consisting of incompletely separated, irregular groups of thyroid follicles (20 to 40 in number) bound together by delicate connective tissue. Synonym: lobuli glandulae thyroideae. (05 Mar 2000) |
| long-acting thyroid stimulator | <endocrinology, immunology> A thyroid stimulating antibody which is directed against a receptor for TSH on the thyroid gland. This antibody acts like TSH and stimulates the thyroid to produce excessive amounts of thyroid hormone. The presence of this antibody generally indicates Grave's disease (hyperthyroidism). Acronym: LATS (15 Nov 1997) |
| lowest thyroid artery | <anatomy, artery> An inconstant artery; origin, arch of aorta or brachiocephalic artery; distribution, thyroid gland. Synonym: arteria thyroidea ima, lowest thyroid artery, Neubauer's artery. (05 Mar 2000) |
| acinar carcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinic cell carcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| acinous carcinoma | <tumour> An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Synonym: acinar carcinoma, acinic cell carcinoma, acinose carcinoma, acinous carcinoma. (05 Mar 2000) |
| adenoid cystic carcinoma | <tumour> A histologic type of carcinoma characterised by large epithelial masses containing round, glandlike spaces or cysts which frequently contain mucus or collagen and are bordered by a few or many layers of epithelial cells without intervening stroma, forming a cribriform pattern like a slice of Swiss cheese; perineural invasion and haematogenous metastasis are common; occurs most commonly in salivary glands. Synonym: cylindromatous carcinoma. (05 Mar 2000) |
| adenoid squamous cell carcinoma | <tumour> A malignant neoplasm consisting chiefly of glandular epithelium (adenocarcinoma), usually well differentiated, with foci of metaplasia to squamous (or epidermoid) neoplastic cells. Synonym: adenoid squamous cell carcinoma. (05 Mar 2000) |
| adenosquamous carcinoma | <tumour> A type of lung tumour exhibiting areas of clear cut glandular and squamous cell differentiation along with regions of the undifferentiated carcinoma. (05 Mar 2000) |
| adnexal carcinoma | <tumour> A carcinoma arising in, or forming structures resembling, skin appendages. (05 Mar 2000) |
| alveolar cell carcinoma | <tumour> A carcinoma, thought to be derived from epithelium of terminal bronchioles, in which the neoplastic tissue extends along the alveolar walls and grows in small masses within the alveoli; involvement may be uniformly diffuse and massive, or nodular, or lobular; microscopically, the neoplastic cells are cuboidal or columnar and form papillary structures; mucin may be demonstrated in some of the cells and in the material in the alveoli, which also includes denuded cells; metastases in regional lymph nodes, and even in more distant sites, are known to occur, but are infrequent. Synonym: alveolar cell carcinoma, bronchiolar adenocarcinoma, bronchiolo-alveolar carcinoma, bronchioloalveolar adenocarcinoma. (05 Mar 2000) |
| anaplastic carcinoma | <tumour> Carcinoma with absence of epithelial structural differentiation. (05 Mar 2000) |
| apocrine carcinoma | <tumour> A carcinoma composed predominantly of cells with abundant eosinophilic granular cytoplasm, occurring in the breast, a carcinoma of the apocrine glands. (05 Mar 2000) |