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Medical Dictionary


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tuboplasty (too′bo-plas-te)
SYN: salpingoplasty.

tubotorsion (too′bo-tor-shun)
Twisting of a tubular structure, such as an oviduct. SYN: tubatorsion. [tubo- + L. torsio, torsion]

tubotympanic, tubotympanal (too′bo-tim-pan′ik, -tim′pa-nal)
Relating to the pharyngotympanic (auditory) tube and the tympanic cavity of the ear.

tubouterine (too′bo-oo′ter-in)
Relating to a uterine tube and the uterus.

tubovaginal (too-bo-vaj′i-nal)
Relating to a uterine tube and the vagina.

tubular (too′bu-lar)
Relating to or of the form of a tube or tubule. SYN: tubuliform.

tubulature (tu′bu-la-choor)
The short neck of a retort.

tubule (too′bul) [TA]
A small tube. SYN: tubulus [TA] . [L. tubulus, dim. of tubus, tube] Albarran y Dominguez tubules SYN: Albarran glands, under gland. connecting t. a narrow arching t. of the kidney joining the distal convoluted t. and the collecting t.. convoluted t. of kidney the highly convoluted segments of the nephron in the renal labyrinth comprising the proximal convoluted t., which leads from Bowman capsule to the descending limb of Henle loop, and the distal convoluted t., which leads from the ascending limb of Henle loop to the collecting tube. SYN: Ferrein tube, tubuli contorti (1) , tubulus renalis contortus. convoluted seminiferous t. SYN: seminiferous tubules. dental tubules SYN: canaliculi dentales, under canaliculus. dentinal tubules SYN: canaliculi dentales, under canaliculus. discharging t. a urinary t. formed by the union of several collecting tubules and terminating as a papillary duct. Henle tubules the straight portions of the uriniferous tubules that form the Henle loop, distinguished as the descending and ascending tubules of Henle. Kobelt tubules remnants of the mesonephric tubules in the female, contained within the epoöphoron. SYN: wolffian tubules. malpighian tubules in insects, slender tubular or hairlike excretory structures that emerge from the alimentary canal between the mesenteron (midgut) and proctodeum (hindgut) in a region frequently termed the pylorus; they vary in number from 1 to over 100, and may be assorted in equally sized bundles in some insects. mesonephric t. an excretory t. of the mesonephros. SYN: segmental t.. metanephric t. an excretory unit of the metanephros or permanent kidney. paragenital tubules remnants of embryonic mesonephric tubules, some of which form the paradidymis. pronephric t. an excretory unit of the pronephros, present only in vestigial form in human embryos. segmental t. SYN: mesonephric t.. seminiferous tubules one of two or three twisted curved tubules in each lobule of the testis, in which spermatogenesis occurs. SYN: tubuli seminiferi recti [TA] , convoluted seminiferous t., tubuli contorti (2) . Skene tubules the embryonic urethral glands which are the female homolog of the prostate. spiral t. the segment of urinary t. coming next after the proximal convoluted t.. straight t. one of the straight tubules of the kidney, present in the medulla and pars radiata of the cortex. straight seminiferous t. straight t. of testis. straight t. of testis [TA] the continuation of the tubulus seminifer contortus which becomes straight just before entering the mediastinum to form the rete testis. SYN: tubuli seminiferi recti testi [TA] , straight seminiferous t.&star, tubulus rectus. T t. SYN: tubulus transversus. uriniferous t. the functional unit of the kidney, composed of a long convoluted portion (nephron) and an intrarenal collecting duct. wolffian tubules SYN: Kobelt tubules.

tubuli (too′bu-li)
Plural of tubulus.

tubuliform (too′bu-li-form)
SYN: tubular.

tubulin (too′bu-lin)
A protein subunit of microtubules; it is a dimer composed of two globular polypeptides, α-t. and β-t.. SEE ALSO: dynein. t.-tyrosine ligase an enzyme that covalently links a tyrosine to the C-terminal glutamyl residue of t., coupled with the hydrolysis of ATP to ADP and orthophosphate; this is a unique posttranslational modification that may have a significant role in cytoskeletal traffic, design, and stability.

tubulization (too′bu-li-za′shun)
Enclosing the joined ends of a divided nerve, after neurorrhaphy, in a cylinder of paraffin or of some slowly absorbable material to keep the surrounding tissues from pushing in and preventing union.

tubulocyst (too′bu-lo-sist)
A cyst formed by the dilation of any occluded canal or tube. SYN: tubular cyst.

tubulodermoid (too′bu-lo-der′moyd)
A dermoid cyst arising from a persistent embryonal tubular structure.

tubuloneogenesis (too-bu-lo-ne′o-jen′e-sis)
The formation of new tubules; usually refers to proliferation of tubules in renal tumors such as Wilms tumor or mesoblastic nephroma. [tubule + neogenesis]

tubuloracemose (too′bu-lo-ras′e-mos)
Denoting a gland of combined tubular and racemose structure.

tubulorrhexis (too′bu-lo-rek′sis)
A pathologic process characterized by necrosis of the epithelial lining in localized segments of renal tubules, with focal rupture or loss of the basement membrane. [tubule + G. rhexis, a breaking]

tubulose, tubulous (too′bu-los, -lus)
Having many tubules.

tubulus, pl .tubuli (too′bu-lus, -li) [TA]
SYN: tubule. [L. dim. of tubus, a pipe] tubuli biliferi SYN: biliary ductules, under ductule. tubuli contorti 1. SYN: convoluted tubule of kidney. 2. SYN: seminiferous tubules, under tubule. tubuli dentales SYN: canaliculi dentales, under canaliculus. tubuli epoöphori SYN: transverse ductules of epoöphoron, under ductule. tubuli galactophori SYN: lactiferous ducts, under duct. tubuli lactiferi SYN: lactiferous ducts, under duct. tubuli paroöphori SYN: ductuli paroöphori, under ductulus. t. rectus SYN: straight tubule of testis. t. renalis contortus SYN: convoluted tubule of kidney. tubuli seminiferi recti [TA] SYN: seminiferous tubules, under tubule. tubuli seminiferi recti testi [TA] SYN: straight tubule of testis. t. transversus a tubular invagination of the sarcolemma of skeletal or cardiac muscle fibers that surrounds myofibrils as the intermediate element of the triad; involved in transmitting the action potential from the sarcolemma to the interior of the myofibril. SYN: T tubule.

tubus, pl .tubi (too′bus, -bi)
A tube or canal. [L.] t. digestorius SYN: digestive tract. t. medullaris SYN: central canal. t. vertebralis SYN: vertebral canal.

Tucker
Ervin Alden, U.S. obstetrician, 1862–1902. See T.-McLean forceps.

tuft (tuft)
A cluster, clump, or bunch, as of hairs. enamel t. a group of structures representing defects in tooth mineralization that extend from the dentino-enamel junction into the enamel to about one-half its thickness. malpighian t. SYN: glomerulus (2) . synovial tufts SYN: synovial villi, under villus.

tuftsin (tuf′sin)
A tetrapeptide derived from the Fc region of an immunoglobulin. T. enhances macrophage functions. [Tufts University + -in]

tug, tugging (tug, tug′ing)
A pulling or dragging movement or sensation. tracheal t. 1. a downward pull of the trachea, manifested by a downward movement of the thyroid cartilage, synchronous with the action of the heart and symptomatic of an aneurysm of the aortic arch; the sign is elicited most easily by drawing the cricoid cartilage upward with the thumb and forefinger while the patient sits with head thrown back and mouth closed; 2. a jerky type of inspiration seen when the intercostal muscles and the sternocostal parts of the diaphragm are paralyzed by deep general anesthesia or muscle relaxants; due to the unopposed action of the crura pulling on the dome of the diaphragm and thence on the pericardium, lung roots, and tracheobronchial tree during each inspiration.

tularemia (too-la-re′me-a)
A disease caused by Francisella tularensis and transmitted to humans from rodents through the bite of a deer fly, Chrysops discalis, and other bloodsucking insects; can also be acquired directly through the bite of an infected animal or through handling of an infected animal carcass; symptoms, similar to those of undulant fever and plague, are a prolonged intermittent or remittent fever and often swelling and suppuration of the lymph nodes draining the site of infection; rabbits are an important reservoir host. SYN: deer-fly disease, deer-fly fever, Pahvant Valley fever, Pahvant Valley plague, rabbit fever. [Tulare, Lake and County, CA, + G. haima, blood] glandular t. t. with predominant lymph node infection as the main manifestation. pulmonary t. t. affecting the lungs; tularemic pneumonia. SYN: pulmonic t.. pulmonic t. SYN: pulmonary t..

tulle gras (tool gra′)
A dressing for wounds, used chiefly in France, comprised of wide-mesh curtain net cut into squares and impregnated with soft paraffin (98 parts), balsam of Peru (1 part), and olive oil (1 part). [Fr. oily net]

Tulp, Tulpius
Nicholas (Nicolaus), Dutch anatomist, 1593–1674. See T. valve.

tumefacient (too-me-fa′shent)
Causing or tending to cause swelling. [L. tume-facio, to cause to swell, fr. tumeo, to swell]

tumefaction (too-me-fak′shun)
1. A swelling. SYN: tumentia. 2. SYN: tumescence. [see tumefacient]

tumefy (too′me-fi)
To swell or to cause to swell.

tumentia (too-men′she-a)
SYN: tumefaction (1) . [L. fr. tumeo, to swell]

tumescence (too-mes′ens)
The condition of being or becoming tumid. SYN: tumefaction (2) , turgescence. [L. tumesco, to begin to swell]

tumescent (too-mes′ent)
Denoting tumescence. SYN: turgescent.

tumid (too′mid)
Swollen, as by congestion, edema, hyperemia. SYN: turgid. [L. tumidus]

tumor (too′mor)
1. Any swelling or tumefaction. 2. SYN: neoplasm. 3. One of the four signs of inflammation (t., calor, dolor, rubor) enunciated by Celsus. [L. t., a swelling] acinar cell t. a solid and cystic t. of the pancreas, occurring in young women; t. cells contain zymogen granules. acoustic t. SYN: vestibular schwannoma. acute splenic t. acute splenitis, enlargement, and softening of the spleen, usually due to bacteremia or severe bacterial toxemia. adenoid t. adenoma, or neoplasm with glandlike spaces. adenomatoid t. a small benign t. of the male epididymis and female genital tract, consisting of fibrous tissue or smooth muscle enclosing anastomosing glandlike spaces containing acid mucopolysaccharide lined by flattened cells that have ultra-structural characteristics of mesothelial cells. SYN: benign mesothelioma of genital tract. adenomatoid odontogenic t. a benign epithelial odontogenic t. appearing radiographically as a well-circumscribed, radiolucent-radiopaque lesion usually surrounding the crown of an impacted tooth in an adolescent or young adult; characterized histologically by columnar cells organized in a ductlike configuration interspersed with spindle-shaped cells and amyloidlike deposition that gradually undergoes dystrophic calcification. SYN: adenoameloblastoma, ameloblastic adenomatoid t.. adipose t. SYN: lipoma. ameloblastic adenomatoid t. SYN: adenomatoid odontogenic t.. amyloid t. SYN: nodular amyloidosis. aortic body t. SYN: chemodectoma. Bednar t. SYN: pigmented dermatofibrosarcoma protuberans. benign t. a t. that does not form metastases and does not invade and destroy adjacent normal tissue. SYN: innocent t.. blood t. term sometimes used to denote an aneurysm, hemorrhagic cyst, or hematoma. borderline ovarian t. an ovarian surface epithelial t. in which the growth pattern is intermediate between benign and malignant; includes mucinous, serous, endometrioid, and Brenner tumors of the ovary; highly curable but may recur after surgical removal. SYN: low malignant potential t.. Brenner t. a relatively infrequent benign neoplasm of the ovary, consisting chiefly of fibrous tissue that contains nests of cells resembling transitional type epithelium, as well as glandlike structures that contain mucin; origin is controversial, but it may arise from the Walthard cell rest; ordinarily found incidentally in ovaries removed for other reasons, especially in postmenopausal women. Brooke t. SYN: trichoepithelioma. brown t. a mass of fibrous tissue containing hemosiderin-pigmented macrophages and multinucleated giant cells, replacing and expanding part of a bone in primary hyperparathyroidism. t. burden the total mass of t. tissue carried by a patient with a malignancy. calcifying epithelial odontogenic t. a benign epithelial odontogenic neoplasm derived from the stratum intermedium of the enamel organ; a painless, slowly growing, mixed radiolucent-radiopaque lesion characterized histologically by cords of polyhedral epithelial cells, deposits of amyloid, and spherical calcifications. SYN: Pindborg t.. carcinoid t. a usually small, slow-growing neoplasm composed of islands of rounded, oxyphilic, or spindle-shaped cells of medium size, with moderately small vesicular nuclei, and covered by intact mucosa with a yellow cut surface; neoplastic cells are frequently palisaded at the periphery of the small groups, and the latter have a tendency to infiltrate surrounding tissue. Such neoplasms occur anywhere in the gastrointestinal tract (and in the lungs and other sites), with approximately 90% in the appendix and the remainder chiefly in the ileum, but also in the stomach, other parts of the small intestine, the colon, and the rectum; those of the appendix and small tumors seldom metastasize, but reported incidences of metatases from other primary sites and from tumors exceeding 2.0 cm in diameter vary from 25–75%; lymph nodes in the abdomen and the liver may be conspicuously involved, but metastases above the diaphragm are rare. SEE ALSO: carcinoid syndrome. carotid body t. SYN: chemodectoma. cellular t. a t. composed mainly of closely packed cells. cerebellopontine angle t. SYN: vestibular schwannoma. chromaffin t. SYN: chromaffinoma. Codman t. chondroblastoma of the proximal humerus. collision t. two originally separate tumors, especially a carcinoma and a sarcoma, that appear to have developed by chance in close proximity, so that an area of mingling exists. SEE ALSO: carcinosarcoma. connective t. any t. of the connective tissue group, such as osteoma, fibroma, sarcoma. dermal duct t. a benign small t. derived from the intradermal part of eccrine sweat gland ducts occurring often on the head and neck. dermoid t. SYN: dermoid cyst. desmoid t. SYN: desmoid (2) . desmoplastic small cell t. a high-grade malignant t. found most often in the abdomen of adolescent males; typically t. cells contain both desmin and keratin, i.e., show hybrid features like fetal mesothelial cells; the exact nature of these cells remains unknown. dysembryoplastic neuroepithelial t. a rare low-grade neoplasm most frequently seen in children and associated with seizures and cortical dysplasia; the often multinodular, multicystic t. is composed of oligodendroglial-like cells with accompanying neurons. eighth nerve t. SYN: vestibular schwannoma. embryonal t., embryonic t. a neoplasm, usually malignant, which arises during intrauterine or early postnatal development from an organ rudiment or immature tissue; it forms immature structures characteristic of the part from which it arises, and may form other tissues as well. The term includes neuroblastoma and Wilms t., and is also used to include certain neoplasms presenting in later life, this usage being based on the belief that such tumors arise from embryonic rests. SEE ALSO: teratoma. SYN: embryoma. embryonal t. of ciliary body SYN: embryonal medulloepithelioma. endocervical sinus t. malignant germ cell t. commonly found in the ovary. The t. arises from primitive germ cells and develops into extra-embryonic tissue resembling the yolk sac. SYN: yolk sac carcinoma. endodermal sinus t. a malignant neoplasm occurring in the gonads, in sacrococcygeal teratomas, and in the mediastinum; produces α-fetoprotein and is thought to be derived from primitive endodermal cells. SYN: yolk sac t.. endometrioid t. a t. of the ovary containing epithelial or stromal elements resembling tumors of the endometrium. Erdheim t. SYN: craniopharyngioma. Ewing t. a malignant neoplasm which occurs usually before the age of 20 years, about twice as frequently in males, and in about 75% of patients involves bones of the extremities, including the shoulder girdle, with a predilection for the metaphysis; histologically, there are conspicuous foci of necrosis in association with irregular masses of small, regular, rounded, or ovoid cells (2–3 times the diameter of erythrocytes), with very scanty cytoplasm. SYN: endothelial myeloma, Ewing sarcoma. fecal t. SYN: fecaloma. fibroid t. old term for certain fibromas and leiomyomas. gastrointestinal autonomic nerve t. benign or malignant t. of stomach and small intestine histogenetically related to myenteric plexus; may be familial and related to gastrointestinal neuronal dysplasia. gastrointestinal stromal t. benign or malignant t. composed of unclassifiable spindle cells; immunohistochemically distinct from smooth muscle and Schwann cell tumors. giant cell t. of bone a soft, reddish-brown, sometimes malignant, osteolytic t. composed of multinucleated giant cells and ovoid or spindle-shaped cells, occurring most frequently in an end of a long tubular bone of young adults. SYN: giant cell myeloma, osteoclastoma. giant cell t. of tendon sheath a nodule, possibly inflammatory in nature, arising commonly from the flexor sheath of the fingers and thumb; composed of fibrous tissue, lipid- and hemosiderin-containing macrophages, and multinucleated giant cells. SYN: localized nodular tenosynovitis. glomus t. [MIM*138000] a vascular neoplasm composed of specialized pericytes (sometimes termed glomus cells), usually in single encapsulated nodular masses that may be several millimeters in diameter and occur almost exclusively in the skin, often subungually in the upper extremity; it is exquisitely tender and may be so painful that patients voluntarily immobilize an extremity, sometimes leading to atrophy of muscles; multiple glomus tumors occur, sometimes with autosomal dominant inheritance. Tumors with cavernous spaces lined by glomus cells are called glomangiomas. glomus jugulare t. a glomus t. arising from the jugular glomus and usually presenting initially in the hypotympanum. glomus tympanicum t. a glomus t. arising on the medial wall of the middle ear. Godwin t. SYN: benign lymphoepithelial lesion. granular cell t. a microscopically specific, generally benign t., often involving peripheral nerves in skin, mucosa, or connective tissue, derived from Schwann cells; the abundant cytoplasm contains lysosomal granules, the cells infiltrate between adjacent tissues although growth is slow, and adjacent surface epithelium may show hyperplasia. granulosa cell t. a benign or malignant t. of the ovary arising from the membrana granulosa of the vesicular ovarian (graafian) follicle and frequently secreting estrogen; it is soft, solid, white or yellow, and consists of small round cells sometimes enclosing Call-Exner bodies; larger lipid-containing cells may be present. SYN: folliculoma (1) . Grawitz t. old eponym for renal adenocarcinoma. heterologous t. a t. composed of a tissue unlike that from which it springs. hilar cell t. of ovary SYN: steroid cell t.. histoid t. old term for a t. composed of a single type of differentiated tissue. homologous t. a t. composed of tissue of the same sort as that from which it springs. innocent t. SYN: benign t.. interstitial cell t. of testis SYN: Leydig cell t.. islet cell t. an endocrine t. composed of cells equivalent or related to those in the normal islet of Langerhans; may be benign or malignant; usually hormonally active; comprises insulinomas, glucagonomas, vipomas, somatostatinomas, gastrinomas, pancreatic polypeptide-secreting t., and multihormonal or hormonally inactive pancreatic islet cell tumors. juxtaglomerular cell t. a t. of juxtaglomerular cell origin usually presenting with symptoms of secondary aldosteronism, including severe diastolic hypertension, which appears to be due to t.-produced renin. The histologic appearance resembles that of a hemangiopericytoma. Klatskin t. adenocarcinoma located at the bifurcation of the common hepatic duct. Krukenberg t. a metastatic carcinoma of the ovary, usually bilateral and secondary to a mucous carcinoma of the stomach, which contains signet-ring cells filled with mucus. Landschutz t. a transplantable, possibly isoantigenic, highly virulent neoplasm which can be grown in any strain of mice; the host is killed in a few days by what is apparently an anaplastic carcinoma. Leydig cell t. a testicular and, less commonly, ovarian neoplasm composed of Leydig cells, usually benign but may be malignant; may secrete androgens or estrogens. SYN: interstitial cell t. of testis. Lindau t. SYN: hemangioblastoma. low malignant potential t. SYN: borderline ovarian t.. malignant t. a t. that invades surrounding tissues, is usually capable of producing metastases, may recur after attempted removal, and is likely to cause death of the host unless adequately treated. SEE ALSO: cancer. malignant mixed müllerian t. (MMMT) SYN: mixed mesodermal t.. melanotic neuroectodermal t. of infancy a benign neoplasm of neuroectodermal origin that most often involves the anterior maxilla of infants in the first year of life. It presents clinically as a rapidly growing blue-black lesion producing a destructive radiolucency; histologically, it is characterized by small, round, undifferentiated t. cells interspersed with larger polyhedral melanin-producing cells arranged in an alveolar configuration. SYN: melanoameloblastoma, pigmented ameloblastoma, pigmented epulis, progonoma of jaw, retinal anlage t.. Merkel cell t. a rare malignant cutaneous t. seen in sun-exposed skin of elderly patients composed of dermal nodules of small round cells with scanty cytoplasm in a trabecular pattern; the t. cells contain cytoplasmic dense core granules resembling neurosecretory granules seen in Merkel cells. SYN: primary neuroendocrine carcinoma of the skin, trabecular carcinoma. mesonephroid t. SYN: mesonephroma. mixed t. a t. composed of two or more varieties of tissue. mixed mesodermal t. a sarcoma of the body of the uterus arising in older women, composed of more than one mesenchymal tissue, especially including striated muscle cells. SYN: malignant mixed müllerian t.. mixed t. of salivary gland a t. composed of salivary gland epithelium and fibrous tissue with mucoid or cartilaginous areas. SYN: pleomorphic adenoma. mixed t. of skin SYN: chondroid syringoma. mucoepidermoid t. SYN: mucoepidermoid carcinoma. Nelson t. a pituitary t. causing the symptoms of Nelson syndrome. oil t. SYN: lipogranuloma. oncocytic hepatocellular t. SYN: fibrolamellar liver cell carcinoma. organoid t. a t. of complex structure, glandular in origin, containing epithelium, connective tissue, etc. Pancoast t. any carcinoma of the lung apex causing the Pancoast syndrome by invasion or compression of the brachial plexus and stellate ganglion. SYN: superior pulmonary sulcus t.. papillary t. SYN: papilloma. paraffin t. SYN: paraffinoma. phantom t. accumulation of fluid in the interlobar spaces of the lung, secondary to congestive heart failure, radiologically simulating a neoplasm. phyllodes t. a spectrum of neoplasms consisting of a mixture of benign epithelium and stroma with variable cellularity and cytologic abnormalities, ranging from benign phyllodes t. to cytosarcoma phyllodes; most often involves the breast. pilar t. of scalp a solitary t. of the scalp in elderly women that may ulcerate; microscopically resembles squamous cell carcinoma composed of glycogen-rich clear cells, but is benign. SYN: proliferating tricholemmal cyst. Pindborg t. SYN: calcifying epithelial odontogenic t.. Pinkus t. SYN: fibroepithelioma. placental site trophoblastic t. a t. usually arising in the uterus of parous women during reproductive years. Histologically, the t. consists of a predominance of intermediate trophoblastic cells with fibrinoid material and vascular invasion. pontine angle t. a t. in the angle formed by the cerebellum and the lateral pons, often refers to an acoustic schwannoma. potato t. of neck a firm nodular mass in the neck, usually a carotid body t. (chemodectoma). pregnancy t. SYN: granuloma gravidarum. primitive neuroectodermal t. a designation used to refer to a group of morphologically similar embryonal neoplasms that arise in intracranial and peripheral sites of the nervous system and which may show various degrees of cellular differentiation; includes medulloblastoma, pineoblastoma, etc. ranine t. SYN: ranula (2) . Rathke pouch t. SYN: craniopharyngioma. retinal anlage t. SYN: melanotic neuroectodermal t. of infancy. Rous t. SYN: Rous sarcoma. sand t. SYN: psammomatous meningioma. Sertoli cell t. a t. of testis or ovary composed of Sertoli cells; most often benign but may be malignant. Sertoli-Leydig cell t. an ovarian t. composed of Sertoli and Leydig cells; may secrete androgens. SYN: arrhenoblastoma, gynandroblastoma (1) . Sertoli-stromal cell t. a generic term for ovarian sex-cord stromal t. composed of Sertoli cells, Leydig cells, and cells resembling rete epithelial cells, either in a pure form or as a mixture of these cell types. solitary fibrous t. a benign t. of fibrous tissue which usually arises in the pleural space on other sites. SYN: benign mesothelioma. squamous odontogenic t. a benign epithelial odontogenic t. thought to arise from the epithelial cell rests of Malassez; appears clinically as a radiolucent lesion closely associated with the tooth root and histologically as islands of squamous epithelium enclosed by a peripheral layer of flattened cells. steroid cell t. a collective term used for ovarian tumors composed of cells resembling steroid-secreting lutein cells; comprises several tumors such as stromal luteoma, Leydig cell t., steroid cell t. not otherwise specified; hormonally active; may be benign or malignant. SYN: hilar cell t. of ovary. sugar t. a benign clear cell t. of the lung containing abundant glycogen. superior pulmonary sulcus t. SYN: Pancoast t.. teratoid t. SYN: teratoma. theca cell t. SYN: thecoma. triton t. a peripheral nerve t. with striated muscle differentiation, seen most often in neurofibromatosis; named after the Masson theory of transformation of motor nerve fibers into muscle in triton salamanders. turban t. multiple cylindromas of the scalp which, when overgrown, may resemble a turban. villous t. SYN: villous papilloma. Warthin t. SYN: adenolymphoma. Wilms t. a malignant renal t. of young children, composed of small spindle cells and various other types of tissue, including tubules and, in some cases, structures resembling fetal glomeruli, and striated muscle and cartilage. Often inherited as an autosomal dominant trait [MIM*194070, *194080, *194090]. SYN: nephroblastoma. yolk sac t. SYN: endodermal sinus t.. Zollinger-Ellison t. a non–beta cell t. of pancreatic islets causing the Zollinger-Ellison syndrome.

tumoricidal (too′mor-i-si′dal)
Denoting an agent destructive to tumors. [tumor + L. caedo, to kill]

tumorigenesis (too′mor-i-jen′e-sis)
Production of a new growth or growths. [tumor + G. genesis, origin] foreign body t. induction of malignant tumors in tissues by nonviable, nonabsorable solid material not known to contain a chemical carcinogen.

tumorigenic (too′mor-i-jen′ik)
Causing or producing tumors.

tumorlets (too′mor-lets)
Minute foci of atypical bronchiolar epithelial hyperplasia that are found multifocally; although now considered benign, they were once believed to be precursors of carcinoma.

tumorous (too′mor-us)
Swollen; tumorlike; protuberant.

tumultus cordis (too-mul′tus kor′dis)
Palpitation and irregular action of the heart.

TUNEL
Abbreviation for terminal deoxynucleotidyl transferase-mediated dUTP-biotin end labeling of fragmented DNA; this method uses immunohistochemistry to identify DNA fragmentation in nuclei of cells undergoing apoptosis.

Tunga penetrans (tung′a pen′e-tranz)
A member of the flea family, Tungidae, commonly known as chigger flea, sand flea, chigoe, or jigger; the minute female penetrates the skin, frequently under the toenails; as she becomes distended with eggs to about pea size, a painful ulcer with inflammation develops at the site. SYN: Sarcopsylla penetrans.

tungiasis (tung-i′a-sis)
Infestation with sand fleas (Tunga penetrans).

Tungidae (tung′i-de)
A family of fleas containing the jigger or chigoe flea species, Tunga penetrans.

tungstate (tung′stat)
An anionic form of tungsten. calcium t. a phosphor with a high stopping power for x-rays that was formerly used widely in fluoroscopic screens and intensifying screens for radiography.

tungsten (W) (tung′sten)
A metallic element, atomic no. 74, atomic wt. 183.85. SYN: wolfram, wolframium. [Swed. tung, heavy, + sten, stone] t. carbide one of the hardest known materials, used as an abrasive and in the manufacture of dental cutting instruments.

tunic (too′nik)
Coat or covering; one of the enveloping layers of a part, especially one of the coats of a blood vessel or other tubular structure. SEE ALSO: layer. SYN: tunica. [L. tunica] Bichat t. the tunica intima of the blood vessels. Brücke t. SYN: tunica nervea. fibrous t. of corpus spongiosum SYN: tunica albuginea of corpus spongiosum. fibrous t. of eye SYN: fibrous layer of eyeball. mucosal tunics, mucous tunics SYN: mucosa. muscular tunics muscular layer. muscular t. of gallbladder SYN: muscular layer of gallbladder. nervous t. of eyeball SYN: inner layer of eyeball. serous t. SYN: serosa. vascular t. of eye SYN: vascular layer of eyeball.




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