sebaceous adenoma

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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.
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.

se·ba·ceous ad·e·no·ma

a benign neoplasm of sebaceous tissue, with a predominance of mature secretory sebaceous cells. Compare: adenoma sebaceum.

se·ba·ceous ad·e·no·ma

(sĕ-bā'shŭs ad'ĕ-nō'mă)
A benign neoplasm of sebaceous tissue, with a predominance of mature secretory sebaceous cells.


pertaining to or secreting sebum.

sebaceous adenitis
inflammation of the sebaceous gland; includes granulomatous lesions.
sebaceous adenoma
particularly common in the skin of aged dogs. On the eyelids they arise from the meibomian glands.
sebaceous cyst
a benign retention cyst containing sebum.
sebaceous epithelioma
basal cell tumor with sebaceous differentiation.
sebaceous gland
holocrine glands in the skin that secrete sebum usually through the hair follicles. They vary in size and activity between species and location. In dogs, large sebaceous glands are located on the dorsum of the tail (see tail gland) and at mucocutaneous junctions. In cats, large glands are located also on the dorsum of the tail, on the lip margins and under the chin (see submental organ).
sebaceous gland secretion abnormality
includes sebolith, seborrhea.
sebaceous secretion
see sebum.
supracaudal sebaceous gland
see supracaudal organ.
References in periodicals archive ?
Some sebaceous adenomas secrete oodles of sebum, creating the constant appearance of an oil slick on the dog's hair coat.
Some sebaceous adenomas are pretty darned unsightly, looking like warty little aliens poking through the hair coat.
15) One or 2 cell layers of basaloid germinative cells are usually present at the periphery of the lobules but, in contrast to sebaceous adenoma, the sebocytes and surrounding basaloid cells are not intimately admixed.
A variant of sebaceous adenoma, composed of variably sized lobules of predominantly basaloid cells admixed with single or clustered mature sebocytes; basaloid epithelial cells comprise 50% or more of the tumor (hematoxylin-eosin, original magnification X20).
Cystic sebaceous adenomas have thin cyst walls lined by basaloid cells, which show regular maturation into sebocytes toward the lumen; mitotic figures are rare.
The most specific cutaneous finding in patients with Muir-Torre syndrome is sebaceous adenoma, but other sebaceous neoplasms, such as sebaceoma, sebaceous carcinoma, and occasionally also keratoacanthomas, are also seen.
Loss of p21(WAF1) compartmentalisation in sebaceous carcinoma compared with sebaceous hyperplasia and sebaceous adenoma.
In this study we analyzed MTS-associated sebaceous neoplasms and sporadic counterparts to determine the prevalence of loss of expression of MMR proteins, the specificity, and the sensitivity of the immunohistochemical analysis for sebaceous adenomas, sebaceous carcinomas and sebaceomas.
There was an observed difference between sebaceous adenomas, carcinomas, and sebaceomas in the rate of the overall loss of the expression of MMR proteins and a positive correlation to the patients' history for internal malignancy.