| bronchopulmonary sequestration | A developmental anomaly in which a mass of nonfunctioning lung tissue lacks normal connection with the tracheobroncheal tree and receives an anomalous blood supply originating from the descending thoracic or abdominal aorta. The mass may be extralobar, i.e., completely separated from normally connected lung, or intralobar, i.e., partly surrounded by normal lung. (12 Dec 1998) |
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| sequestration | 1. Formation of a sequestrum. 2. Loss of blood or of its fluid content into spaces within the body so that it is withdrawn from the circulating volume, resulting in haemodynamic impairment, hypovolaemia, hypotension, and reduced venous return to the heart. Origin: L. Sequestratio, fr. Sequestro, pp. -atus, to lay aside (05 Mar 2000) |
| sequestration cyst | A collection of cancerous cells which form cysts that contain one or more of the three primary embryonic germ layers: skin, hair or teeth. (27 Sep 1997) |
| sequestration dermoid | An obsolete term for epidermal cyst. (05 Mar 2000) |
| disc sequestration | <radiology> Complete separation of disc material with rupture through posterior longitudinal ligament into the epidural space; free fragment herniation findings: migration superiorly/inferiorly with compression of nerve roots above/below the level of herniation, disc material noted more than 9mm from disc space Differential diagnosis: postoperative scarring (retraction of thecal sac to the site of surgery), epidural abscess/tumour, conjoined nerve root: 2 nerve roots arising simultaneously from the thecal sac; normal variant in 1-3% see: degenerative disc disease (12 Dec 1998) |
| intralobar sequestration | <radiology> Nonfunctioning portion of lung <indent>WITHIN visceral pleura of a pulmonary lobe, left lower lobe (67%); rarely in upper lobes, arterial supply: SYSTEMIC, usually aorta, venous drainage: usually via pulmonary. Vv. (occasionally systemic), usually does not communicate with bronchial tree, cystic, may become infected, not associated with other abnormalities see: sequestration Cf: extralobar sequestration (12 Dec 1998) |
| extralobar sequestration | <radiology> Accessory lung: lung tissue in its own pleura, left lower lobe (90%), systemic arterial AND venous connection (unlike intralobar) results in L to R shunt, associated with congenital anomalies of diaphragm: eventration, paralysis, ipsilateral hernia, XR: homogeneous ST mass, rarely infected see also: sequestration Cf: intralobar sequestration (12 Dec 1998) |
| biochemical | Relating to biochemistry, characterised by, produced by or involving chemical reactions in living organisms. (18 Nov 1997) |
| biochemical conversion process | The use of living organisms or their products to convert organic material to fuels. (05 Dec 1998) |
| biochemical genetics | The study of genetics in terms of the chemical (biochemical) events involved, as in the manner in which DNA molecules replicate and control the synthesis of specific enzymes by the genetic code. (05 Mar 2000) |
| biochemical mechanism | This is the general term for any chemical reaction or series of reactions, usually mediated by enzymes, which produce a given physiological effect in a living organism. (09 Oct 1997) |
| biochemical metastasis | The transportation and induction of abnormal immunochemical specificities in apparently normal organs. (05 Mar 2000) |
| biochemical oxygen demand | The amount of oxygen aerobicorganisms need to carry out oxidative metabolism in watercontaining organic matter, such as sewage. (09 Oct 1997) |
| biochemical phenomena | Biochemical functions, activities, and processes at organic and molecular levels in humans, animals, microorganisms, and plants. (12 Dec 1998) |
| biochemical profile | A combination of biochemical tests usually performed with automated instrumentation upon admission of a patient to a hospital or clinic. (05 Mar 2000) |