| unilateral hermaphroditism | Hermaphroditism in which the doubling of sex characteristics occurs on one side only: ovotestis on one side and either ovary or testis on the other. (05 Mar 2000) |
|---|---|
| unilateral hyperlucent lung | Chronic bronchiolitis obliterans predominating on one side. See: unilateral lobar emphysema. (05 Mar 2000) |
| unilateral large kidney | <radiology> Multifocal: xanthogranulomatous pyelonephritis (XGP), malakoplakia, multicystic dysplastic kidney Cf: other urographic patterns smooth kidney: renal vein thrombosis, acute arterial infarction, obstructive uropathy, acute bacterial nephritis, compensatory hypertrophy, duplicated pelvocalyceal system Cf: other urographic patterns multifocal: solid neoplastic mass, malignant, adenocarcinoma, adult nephroblastoma, invasive transitional cell carcinoma, sarcoma, metastasis, benign, hamartoma, adenoma, mesenchymal tumour cystic mass, simple cyst, focal hydronephrosis, multilocular cystic nephroma, arteriovenous malformation Cf: other urographic patterns (12 Dec 1998) |
| unilateral lobar emphysema | A state in which the roentgenographic density of one lung (or one lobe) is markedly less than the density of the other(s) because of the presence of air trapped during expiration. Synonym: Macleod's syndrome, Swyer-James syndrome. (05 Mar 2000) |
| unilateral rib notching | <radiology> Aortic coarctation, proximal to left subclavian artery most likely to be right, anomalous right subclavian artery most likely to be left, subclavian artery stenosis / atresia, most likely to be IPSIlateral, Blalock-Taussig shunt, anastamosis of subclavian artery to pulmonary artery, for Tetralogy of Fallot, most likely to be IPSIlateral (12 Dec 1998) |
| unilateral small kidney | <radiology> Scarred: reflux nephropathy, lobar infarction Cf: other urographic patterns smooth kidney: ischemia due to focal arterial disease, chronic infarction, radiation nephritis, congenital hypoplasia, post-obstructive atrophy, post-inflammatory atrophy, reflux atrophy Cf: other urographic patterns (12 Dec 1998) |
| unilobar | Having but one lobe. (05 Mar 2000) |
| unilocal | Strictly, denoting a trait in which the genetic component is contributed exclusively by one locus; in practice, any trait in which the contribution from one locus is so large that the data are readily interpreted as mendelian. (05 Mar 2000) |
| unilocular | <plant biology> Describes an ovary, anther or fruit which has only one internal cavity. (09 Oct 1997) |
| unilocular cyst | A cyst having a single sac. Synonym: unicameral cyst. (05 Mar 2000) |
| unilocular fat | Adipose tissue in which the fat is present in a single droplet within the fat cells. Synonym: white fat. (05 Mar 2000) |
| unilocular hydatid cyst | The commonest form of hydatid cyst in man, caused by Echinococcus granulosus and found in the liver, lungs, or any other site where the hexacanth embryo may settle if it passes the hepatic or pulmonary capillary filters; characterised by large balloon-like forms lined internally with a germinative membrane, enclosed externally in a laminated membrane within a host-parasite capsule, and filled with fluid (hydatid fluid) and infectious scoleces of the young tapeworms (hydatid sand). (05 Mar 2000) |
| unilocular joint | One in which an intra-articular disk is incomplete or absent, the joint having but a single cavity. (05 Mar 2000) |
| unimolecular | Denoting a single molecule. Synonym: monomolecular. (05 Mar 2000) |
| unimolecular reaction | A reaction involving a single molecule (e.g., decomposition, intramolecular rearrangement, intramolecular oxidation or reduction), even if a catalytic agent, such as acid or alkali, is present in large excess, on a molecular basis, or is not rate-determining; such reaction's are usually first-order reaction's. Compare: molecularity. Synonym: unimolecular reaction. (05 Mar 2000) |