adenoma

adenoma

 [ad″ĕ-no´mah]

a benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are derived from glandular epithelium.

acidophilic adenoma in a classification system formerly used for pituitary adenomas, an adenoma whose cells stain pale pink with acid dyes; most adenomas that secreted excessive amounts of growth hormone were in this group

ACTH-secreting adenoma (adrenocorticotrophic hormone–secreting adenoma) corticotroph adenoma.

basophilic adenoma in a classification system formerly used for pituitary adenomas, an adenoma whose cells stain pale blue with basic dyes; most adenomas that secreted excessive amounts of adrenocorticotrophic hormone were in this group.

chromophobe adenoma (chromophobic adenoma) a pituitary adenoma composed of cells that lack acidophilic or basophilic granules; this is the same entity as the more precisely named null-cell a.

corticotrope adenoma (corticotroph adenoma) a pituitary adenoma made up predominantly of corticotrophs; excessive corticotropin secretion may cause Cushing's disease or Nelson's syndrome. Called also ACTH-secreting or adrenocorticotropic hormone–secreting adenoma and corticotropinoma.

endocrine-active adenoma a pituitary adenoma that secretes excessive amounts of a hormone; see prolactinoma, corticotroph adenoma, gonadotroph adenoma, growth hormone–secreting adenoma, and thyrotroph adenoma. Called also hyperfunctional or hyperfunctioning adenoma.

endocrine-inactive adenoma a pituitary adenoma that does not secrete excessive amounts of any hormone; many null-cell adenomas are of this type. Called also nonfunctional or nonfunctioning adenoma and nonsecreting or nonsecretory adenoma.

eosinophilic adenoma growth hormone–secreting adenoma.

gonadotrope adenoma (gonadotroph adenoma) a rare type of pituitary adenoma made up of gonadotroph-like cells that secrete excessive amounts of follicle-stimulating hormone or luteinizing hormone or both; it may cause precocious puberty, visual disturbances, or hypogonadism.

growth hormone–secreting adenoma a pituitary adenoma made up of somatotroph-like cells that secrete excessive amounts of growth hormone; it may cause gigantism in children or acromegaly in adults. Called also somatotrope or somatotroph adenoma and eosinophilic adenoma.

hepatocellular adenoma a large, fleshy, hypervascular tumor of the liver occurring chiefly in women of childbearing age and associated with oral contraceptive use. It is composed of sheets of cells with areas of hemorrhage and necrosis and has a tendency to hemorrhage and rupture; it may become malignant.

Hürthle cell adenoma a benign hürthle cell tumor.

hyperfunctional adenoma (hyperfunctioning adenoma) endocrine-active adenoma.

lactotrope adenoma (lactotroph adenoma) prolactinoma.

liver cell adenoma hepatocellular adenoma.

nonfunctional adenoma (nonfunctioning adenoma) endocrine-inactive adenoma.

nonsecreting adenoma (nonsecretory adenoma) endocrine-inactive adenoma.

null-cell adenoma a pituitary adenoma whose cells give negative results on tests for staining and hormone secretion; although classically they were considered to be composed of sparsely granulated or degranulated (nonfunctioning) cells, some contain functioning cells and may be associated with a hyperpituitary state such as acromegaly or Cushing's syndrome. These tumors are often discovered clinically only when they have grown large and are pressing on surrounding structures. Called also chromophobic adenoma.

pituitary adenoma a benign neoplasm of the anterior pituitary gland; some contain hormone-secreting cells (endocrine-active adenomas) but some are not secretory (endocrine-inactive adenomas).

plurihormonal adenoma an endocrine-active adenoma that secretes more than one kind of hormone.

prolactin cell adenoma (prolactin-secreting adenoma) prolactinoma.

sebaceous adenoma hypertrophy or benign hyperplasia of a sebaceous (oil-secreting) gland.

adenoma seba´ceum nevoid hyperplasia of sebaceous glands, forming multiple yellow papules or nodules on the face. See also nevus.

somatotrope adenoma (somatotroph adenoma) growth hormone–secreting adenoma.

thyroid-stimulating hormone–secreting adenoma thyrotroph adenoma.

thyrotrope adenoma (thyrotroph adenoma) (TSH-secreting adenoma) a rare type of pituitary adenoma made up of thyrotroph-like cells that secrete excess thyrotropin and cause hyperthyroidism; called also thyroid stimulating hormone–secreting adenoma.

villous adenoma a large soft papillary polyp on the mucosa of the large intestine.

ad·e·no·ma

(ad'ĕ-nō'mă),

A benign epithelial neoplasm in which the tumor cells form glands or glandlike structures; usually well circumscribed, tending to compress rather than infiltrate or invade adjacent tissue.

[adeno- + G. -oma, tumor]

adenoma

/ad·e·no·ma/ (ad″ĕ-no´mah) a benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are derived from glandular epithelium.

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adrenocortical adenoma  a benign tumor of the adrenal cortex, usually small and unilateral; most types cause endocrine symptoms.

basal cell adenoma  a benign, encapsulated, slow-growing, painless salivary gland tumor of intercalated or reserve cell origin, occurring mainly in males, in the parotid gland or upper lip; solid, canalicular, trabecular-tubular, and membranous types can be distinguished histologically.

bile duct adenoma  a small firm white nodule with multiple bile ducts embedded in a fibrous stroma.

bronchial adenomas  tumors of low-grade malignancy situated in the submucosal tissues of large bronchi; sometimes composed of well-differentiated cells and usually circumscribed, with two histologic forms: carcinoid and cylindroma.

carcinoma ex pleomorphic adenoma  see under carcinoma .

chromophobe adenoma , chromophobic adenoma null-cell a.

corticotroph adenoma  a pituitary adenoma made up predominantly of corticotrophs and secreting excess corticotropin.

follicular adenoma  adenoma of the thyroid in which the cells are arranged in the form of follicles.

glycoprotein adenoma  a pituitary adenoma that causes excessive secretion of one of the three glycoprotein hormones (follicle-stimulating hormone, luteinizing hormone, and thyrotropin).

hepatocellular adenoma  a benign circumscribed tumor of the liver, usually in the right lobe, growing in a sheetlike fashion; it may be highly vascular with a tendency to hemorrhage and with areas of necrosis.

Hürthle cell adenoma  see under tumor.

liver cell adenoma  hepatocellular a.

macrofollicular adenoma  a follicular adenoma composed of large follicles filled with colloid and lined with flat epithelium.

microfollicular adenoma  a follicular adenoma with small, closely-packed follicles lined with epithelium.

mixed-cell adenoma  a pituitary adenoma containing more than one cell type, usually making it plurihormonal.

monomorphic adenoma  any of a group of benign salivary gland tumors that lack connective tissue changes and are each predominantly composed of a single cell type.

nipple adenoma  a benign lesion of the breast, clinically resembling Paget's disease of the breast, consisting of ductal and stromal proliferation beneath the nipple, which presents as a mass, ulceration, or erosion, with a serous or bloody discharge.

null-cell adenoma  a pituitary adenoma whose cells give negative results on tests for staining and hormone secretion, although some may contain functioning cells and be associated with a hyperpituitary state.

oncocytic adenoma , oxyphilic adenoma

1. oncocytoma.

2. Hürthle cell adenoma.

papillary adenoma  nipple a..

papillary cystic adenoma  papillary cystadenoma.

pituitary adenoma  a benign neoplasm of the anterior pituitary gland; the endocrine-active a's contain cells that secrete anterior pituitary hormones; the endocrine-inactive a's are not secretory.

pleomorphic adenoma  a benign, slow-growing, epithelial tumor of the salivary gland, usually of the parotid gland, sometimes serving as a locus for development of a malignant epithelial neoplasm (malignant pleomorphic a.) .

plurihormonal adenoma  an endocrine-active adenoma that secretes two or more hormones, usually growth hormone and one or more of the glycoprotein types.

sebaceous adenoma 

1. an uncommon, benign, yellow or flesh-colored, circumscribed nodule occurring on the face or scalp, generally in older men, consisting of incompletely differentiated sebaceous lobules.

2. a. sebaceum.

adenoma seba´ceum 

1. cutaneous angiofibromatous proliferation, usually on the face, in association with tuberous sclerosis.

2. nevoid hyperplasia of sebaceous glands, forming multiple yellow papules or nodules of the face.

trabecular adenoma  a follicular adenoma whose cells are closely packed to form cords or trabeculae, with only a few small follicles.

tubular adenoma 

1. an adenoma whose cells are arranged in tubules.

2. androblastoma (1).

3. the most common type of adenomatous polyp of the colon, with tubules highly variable in size and often occurring singly.

villous adenoma  an uncommon type of adenomatous polyp of the colon that is large, soft, and papillary and often premalignant.

adenoma

(ăd′n-ō′mə)

n. pl. adeno·mas or adeno·mata (-mə-tə)

A benign epithelial tumor having a glandular origin and structure.

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ad′e·nom′a·toid′ (ăd′n-ŏm′ə-toid′) adj.

ad′e·nom′a·tous (-ŏm′ə-təs) adj.

adenoma

[ad′ənō′mə] pl. adenomas, adenomata

Etymology: Gk, aden + oma

a benign tumor of glandular epithelium in which the cells of the tumor are arranged in a recognizable glandular structure. An adenoma may cause excess secretion by the affected gland, such as an acidophilic adenoma resulting in an excess of growth hormone. Kinds of adenomas include acidophilic adenoma, basophilic adenoma, fibroadenoma, and insulinoma. adenomatoid, adenomatous, adj.

adenoma

A generic term for a benign epithelial tumour composed of glands and/or glandular elements.

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adenoma (large intestine)

A premalignant lesion consisting of a dysplastic clonal proliferation of colonic epithelium.

Epidemiology
12% of the US population has adenomas by the 5th decade of life, of which 25% are high-risk (high-grade dysplasia) lesions; the risk of future carcinoma is increased if there is a positive family history and a “high-risk” diet—e.g., high meat, high fat, low fibre.

ad·e·no·ma

, pl. adenomas, pl. adenomata (ad'ĕ-nō'mă, -măz, -mă-tă)

An ordinarily benign neoplasm of epithelial tissue in which the tumor cells form glands or glandlike structures in the stroma; usually well circumscribed, tending to compress rather than infiltrate or invade adjacent tissue.

[adeno- + G. -oma, tumor]

adenoma

A benign (non-malignant) and relatively common TUMOUR arising from lining tissue that contains glands. The glandular structure is retained in the tumour which may continue to secrete, and often over-produce, the original product.

Adenoma

A growth of cells, usually a benign tumor, that forms a gland or gland-like substance. These tumors can secrete hormones or cause changes in hormone production in nearby glands.

Mentioned in: Acromegaly and Gigantism, Cushing's Syndrome, Hyperaldosteronism, Hypopituitarism, Prolactin Test

ad·e·no·ma

, pl. adenomas, pl. adenomata (ad'ĕ-nō'mă, -măz, -mă-tă)

A benign epithelial neoplasm in which the tumor cells form glands or glandlike structures; usually well circumscribed, tending to compress rather than infiltrate or invade adjacent tissue.

[adeno- + G. -oma, tumor]

adenoma (ad´ənō´mə),

n a benign epithelial neoplasm or tumor with a basic glandular (acinar) structure, suggesting derivation from glandular tissue.

Adenoma.

adenoma, acidophilic,

n See oncocytoma.

adenoma, oxyphilic,

n See oncocytoma.

adenoma

a benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are derived from glandular epithelium. Called also pituitary tumor (acidophil), adrenal gland tumor, apocrine tumor, ceruminous gland tumor, eccrine tumor.

Patient discussion about adenoma

Q. Blood in stools before and after polyp removel, Avms of the deodenel loop, inside hems, and 3cin tubuo adenoma Hi, On Nov of 06 I had a colonoscopy done and they didnt find any thing that could be mking me bleed and go to the rest room often. Then in Nov of 07 did a EDg and found I have AVMs of the deodenel loop.She Burned them and I didnt have any more bleeding till June of thei yr.On 6/6/08 i had another EDg done she burned more AVMs and on Mon I started bleeding again. This time she did a colonoscopy and found I had inside hems and a 3cin tubuolvillous adenoma inflamed.She cut, burned, and took it out in peices.She saye she will go back in Nov of this yr and look again. Two weeks after I had this done I had started to bleed again and had bad such bad pain in my hip I had to hold on to walk. that same day i started to bleed again. I bled out big clots and a bowl full of blood! A few days later the pain went away but was still bleeding ever time I had bowl movement!I can bleed up to 4 days at a times sometimes. I have been taking HC supp. and it seems to have stoped the bleeding and pain!

A. It is normal that after a polyp removal you will continue bleeding some more. However, if you feel like there is a lot of bleeding, and/or you are not feeling well, you should see a doctor as soon as possible to stop the bleeding or look for the source of bleeding.