glomus tumor

tumor /tu·mor/ (too´mer)

1. swelling, one of the cardinal signs of inflammation; morbid enlargement.

2. neoplasm; a new growth of tissue in which cell multiplication is uncontrolled and progressive.

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adenomatoid odontogenic tumor  a benign odontogenic tumor with ductlike or glandlike arrangements of columnar epithelial cells, usually occurring in the anterior jaw region.

Askin's tumor  a malignant small-cell tumor of soft tissue in the thoracopulmonary region in children; one of the peripheral neuroectodermal tumors.

benign tumor  one lacking the properties of invasion and metastasis and showing a lesser degree of anaplasia than do malignant tumors; it is usually surrounded by a fibrous capsule.

Brenner tumor  a rare, usually benign, tumor of the ovary characterized by groups of epithelial cells lying in a fibrous connective tissue stroma.

brown tumor  a giant-cell granuloma produced in and replacing bone, occurring in osteitis fibrosa cystica and due to hyperparathyroidism.

Buschke-Löwenstein tumor  a large, destructive, penetrating, cauliflower-like mass on the prepuce, especially in uncircumcised males, and also in the perianal region.

carcinoid tumor  carcinoid.

carcinoma ex mixed tumor  carcinoma ex pleomorphic adenoma.

carotid body tumor  a chemodectoma of the carotid body, a firm, round mass at the bifurcation of the common carotid artery.

dermal duct tumor  a small, intradermal, papular, eccrine lesion occurring on the head and neck in older adults.

desmoid tumor  an unencapsulated locally invasive fibromatous tumor arising in the musculoaponeurotic tissue, usually the abdominal wall, and often resembling fibrosarcoma.

diarrheogenic tumor  VIPoma.

endodermal sinus tumor  yolk sac t.

erectile tumor  cavernous hemangioma.

Ewing's tumor  see under sarcoma.

false tumor  structural enlargement due to extravasation, exudation, echinococcus, or retained sebaceous matter.

feminizing tumor  a functional tumor that produces feminization in boys and men or precocious sexual development in girls, e.g., germinoma.

fibrohistiocytic tumor  a tumor containing cells resembling histiocytes and others resembling fibroblasts; often used to denote the most general meaning of benign or malignant fibrous histiocytoma.

functional tumor , functioning tumor a hormone-secreting tumor in an endocrine gland.

germ cell tumor  any of a group of tumors arising from primitive germ cells, usually of the testis or ovary.

giant cell tumor 

1. a bone tumor, ranging from benign to frankly malignant, composed of cellular spindle cell stroma containing multinucleated giant cells resembling osteoclasts.

2. a benign, small, yellow, tumor-like nodule of tendon sheath origin, most often of the wrist and fingers or ankle and toes, laden with lipophages and containing multinucleated giant cells.

glomus tumor 

1. a benign, blue-red, painful tumor involving a glomeriform arteriovenous anastomosis (glomus body).

2. chemodectoma.

glomus jugulare tumor  a chemodectoma involving the tympanic body (glomus jugulare).

granular cell tumor  a usually benign, circumscribed, tumor-like lesion of soft tissue, particularly of the tongue, composed of large cells with prominent granular cytoplasm; the histiogenesis is uncertain, but Schwann cell derivation is favored.

granulosa tumor , granulosa cell tumor an ovarian tumor originating in the cells of the membrana granulosa.

granulosa-theca cell tumor  an ovarian tumor composed of granulosa (follicular) cells and theca cells; either form may predominate.

heterologous tumor , heterotypic tumor one made up of tissue differing from that in which it grows.

hilar cell tumor  a rare benign neoplasm of the hilus of the ovary, histologically resembling Leydig cell tumor of the testis.

homologous tumor  one resembling the surrounding parts in its structure.

Hürthle cell tumor  new growth of the thyroid gland composed predominantly of Hürthle cells; it is usually benign (Hürthle cell adenoma) but may be locally invasive or metastasize (Hürthle cell carcinoma or malignant Hürthle cell tumor).

islet cell tumor  a tumor of the pancreatic islets; many secrete excessive amounts of hormones. Types include gastrinoma, glucagonoma, insulinoma, somatostatinoma, and VIPoma.

Krukenberg's tumor  carcinoma of the ovary, usually metastatic from gastrointestinal cancer, marked by areas of mucoid degeneration and by the presence of signet-ring–like cells.

Leydig cell tumor 

1. a usually benign, nongerminal tumor of the Leydig cells of the testis.

2. hilar cell t.

lipoid cell tumor of ovary  a usually benign ovarian tumor composed of eosinophilic cells or cells with lipoid vacuoles; it causes masculinization.

malignant tumor  one having the properties of invasion and metastasis and showing a high degree of anaplasia.

mast cell tumor  mastocytosis.

melanotic neuroectodermal tumor  a benign, rapidly growing, dark tumor of the jaw and occasionally of other sites; seen almost exclusively in infants.

mixed tumor  a tumor composed of more than one type of neoplastic tissue.

müllerian mixed tumor  a malignant mixed tumor of the uterus containing both endometrial adenocarcinoma and sarcomatous cells that may be either of uterine or extrauterine origin.

neuroendocrine tumor , neuroendocrine cell tumor any of a diverse group of tumors containing neurosecretory cells that cause endocrine dysfunction; most are carcinoids or carcinomas.

nonfunctional tumor , nonfunctioning tumor a tumor located in an endocrine gland but not secreting hormones.

odontogenic tumor  a lesion derived from mesenchymal or epithelial elements, or both, that are associated with the development of the teeth; it occurs in the mandible or maxilla, or occasionally the gingiva.

papillary tumor  papilloma.

pearl tumor , pearly tumor cholesteatoma.

peripheral neuroectodermal tumor  a primitive neuroectodermal tumor occurring outside of the central nervous system in a site such as the pelvis, a limb, or the chest wall.

phyllodes tumor  a large, locally aggressive, sometimes metastatic fibroadenoma in the breast, with an unusually cellular, sarcomalike stroma.

primitive neuroectodermal tumor  (PNET) proposed name for a heterogeneous group of neoplasms thought to derive from undifferentiated cells of the neural crest.

proliferating trichilemmal tumor  a large, solitary, multilobulated lesion of the hair follicle, occurring on the scalp, usually in middle-aged or older women; often confused with squamous cell carcinoma.

sand tumor  psammoma.

squamous odontogenic tumor  a benign odontogenic epithelial neoplasm occurring in the mandible or maxilla and believed to derive from transformation of the rests of Malassez.

stromal tumors  a diverse group of tumors derived from the ovarian stroma, many of which secrete sex hormones.

teratoid tumor  teratoma.

testicular tumor  a general term for any tumor of the testes; in adults these are almost always malignant germinomas, whereas in children many are yolk sac tumors or benign varieties such as teratomas or androblastomas.

theca cell tumor  a fibroid-like ovarian tumor containing yellow areas of lipoid material derived from theca cells.

turban tumor  a term used to describe the gross appearance of multiple cutaneous cylindromas of the scalp.

virilizing tumor  a functional tumor that produces virilization in girls and women or precocious sexual development in boys.

Warthin's tumor  adenolymphoma.

Wilms' tumor  a rapidly developing malignant mixed tumor of the kidneys, made up of embryonal elements, usually affecting children before the fifth year.

yolk sac tumor  a germ cell tumor that represents a proliferation of both yolk sac endoderm and extraembryonic mesenchyme; it produces α-fetoprotein and is usually in the testes.

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glomus tumor

n.

A painful tumor composed of specialized pericytes that are usually arranged in single encapsulated nodular masses that occur almost exclusively in the skin. Also called angiomyoneuroma, angioneuromyoma, glomangioma.

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glomus tumor,

a frequently painful neoplasm involving the arteriovenous anastomoses of the skin. It contains many small vascular channels surrounded by glomus cells.

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glomus

pl. glomera [L.] a small histologically recognizable body composed primarily of fine arterioles connecting directly with veins, and having a rich nerve supply.

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glomus caroticum

carotid body.

glomus cell

a specialized cell of the carotid body.

glomus choroideum

an enlargement of the choroid plexus of the lateral ventricle.

glomus tumor

neoplasm of one of the chemoreceptors. Tumors of the glomus jugulare have been reported in a dog.

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glomus tumor

Glomangioma A neoplasm that is most common in age 20-40 which arises in the neuromyoarterial glomus, an AV shunt Clinical When located in the 'usual' subungual site, the abundant innervation makes the tumor exquisitely painful; when located elsewhere–eg, middle ear, stomach, it is painless. Cf Hemagiopericytoma.