| Weber's sign | <syndrome> Midbrain tegmentum lesion characterised by ipsilateral oculomotor nerve paresis and contralateral paralysis of the extremities, face, and tongue. Synonym: Weber's sign. (05 Mar 2000) |
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| Weber's syndrome | <syndrome> Midbrain tegmentum lesion characterised by ipsilateral oculomotor nerve paresis and contralateral paralysis of the extremities, face, and tongue. Synonym: Weber's sign. (05 Mar 2000) |
| Weber's triangle | On the sole of the foot, an area indicated by the heads of the first and fifth metatarsal bone and the centre of the plantar surface of the heel. (05 Mar 2000) |
| Weber, Wilhelm | <person> German physicist, 1804-1891. See: Weber's point, Weber's triangle. (05 Mar 2000) |
| Sturge-Kalischer-Weber syndrome | <syndrome> A congenital syndrome consisting of nevus flammeus of the face, haemangiomas of the leptomeninges and choroid, and late glaucoma. It is often associated with intracranial calcification, mental retardation, contralateral hemiplegia, and epilepsy. (12 Dec 1998) |
| sturge-weber-dimitri syndrome | <radiology> Encephalotrigeminal angiomatosis, leptomeningeal capillary-venous angiomatosis, with subjacent cortical calcification, ipsilateral port-wine stains (venous angioma) of face, ipsilateral congenital glaucoma, contralateral focal sz (90%) and hemiparesis (33-66%), subnormal mentation (50%) (12 Dec 1998) |
| Sturge-Weber disease | <syndrome> A congenital syndrome consisting of nevus flammeus of the face, haemangiomas of the leptomeninges and choroid, and late glaucoma. It is often associated with intracranial calcification, mental retardation, contralateral hemiplegia, and epilepsy. (12 Dec 1998) |
| sturge-weber syndrome | <syndrome> A congenital syndrome consisting of nevus flammeus of the face, haemangiomas of the leptomeninges and choroid, and late glaucoma. It is often associated with intracranial calcification, mental retardation, contralateral hemiplegia, and epilepsy. (12 Dec 1998) |
| syndrome, klippel-trenaunay-weber | A congenital malformation syndrome characterised by the triad of asymmetric limb hypertrophy, haemangiomata, and nevi. Asymmetric limb hypertrophy is enlargement of one limb and not the corresponding limb on the other side, the enlarged limb being 3 times more likely to be a leg than an arm in ktw; and the limb enlargement is of bone as well as soft tissue. The haemangiomas, abnormal nests of blood vessels that proliferate inappropriately and excessively, cover a remarkable range from small innocuous capillary haemangiomas ( strawberry marks ) to huge cavernous haemangiomas. The nevi are pigmented moles on the skin; in ktw there are often also dark linear streaks on the skin, streaks due to too much pigment. There can be other abnormalities but the triad is the consistent clinical centrepiece of the disease. most persons with ktw have an enlarged leg and do relatively well without treatment or, for example, with only compression from an elastic stocking. Skin ulcers and other skin problems can occur over the swollen leg. Usually, the treatment is conservative. Surgery is almost never needed. The only possible exceptions are the very rare situations in which the leg reaches gigantic proportions or secondary clotting difficulties arise (due to trapping and destruction of blood platelets in a huge haemangioma). Then, amputation may become necessary. The cause of ktw syndrome is unknown. (12 Dec 1998) |
| osler-weber-rendu disease | <disease> An inherited disease characterised by thin blood vessel walls in the nose, skin and gastrointestinal tract. This condition ins associated with a high risk of bleeding complications. (27 Sep 1997) |
| Fechner-Weber law | The intensity of a sensation varies by a series of equal increments (arithmetically) as the strength of the stimulus is increased geometrically; if a series of stimuli is applied and so adjusted in strength that each stimulus causes a just perceptible change in intensity of the sensation, then the strength of each stimulus differs from the preceding one by a constant fraction; thus, if a just perceptible change in a visual sensation is produced by the addition of 1 candle to an original illumination of 100 candles, 10 candles will be required to produce any change in sensation when the original illumination was one of 1000 candles. Synonym: Fechner-Weber law, Weber's law. (05 Mar 2000) |
| Klippel-Trenaunay-Weber syndrome | <syndrome> A congenital malformation syndrome characterised by the triad of asymmetric limb hypertrophy, haemangiomata, and nevi. Asymmetric limb hypertrophy is enlargement of one limb and not the corresponding limb on the other side, the enlarged limb being 3 times more likely to be a leg than an arm in ktw; and the limb enlargement is of bone as well as soft tissue. The haemangiomas, abnormal nests of blood vessels that proliferate inappropriately and excessively, cover a remarkable range from small innocuous capillary haemangiomas ( strawberry marks ) to huge cavernous haemangiomas. The nevi are pigmented moles on the skin; in ktw there are often also dark linear streaks on the skin, streaks due to too much pigment. There can be other abnormalities but the triad is the consistent clinical centrepiece of the disease. most persons with ktw have an enlarged leg and do relatively well without treatment or, for example, with only compression from an elastic stocking. Skin ulcers and other skin problems can occur over the swollen leg. Usually, the treatment is conservative. Surgery is almost never needed. The only possible exceptions are the very rare situations in which the leg reaches gigantic proportions or secondary clotting difficulties arise (due to trapping and destruction of blood platelets in a huge haemangioma). Then, amputation may become necessary. The cause of ktw syndrome is unknown. (12 Dec 1998) |
| Abbe test plate | <equipment> A long, wedge-shaped coverslip about 0.20 mm thick at one end and 0.10 to 0.12 mm at the other end coated chemically with a silver film on which are ruled horizontal lines. at each variation in thickness of 0.01 mm there are vertical lines. By means of oblique illumination and by focusing on different portions of the plate, it is possible to determine the optimum coverslip thickness for any objective and also, for microscopes with drawtubes, the tube length for best objective performance. The approximate freedom from spherical and chromatic aberrations can also be estimated. Small isolated bits of silver near the edges of the lines form good objects for the star test (05 Aug 1998) |
| acetone test | A test for ketonuria; the suspected urine is shaken up with a few drops of sodium nitroprusside, and strong ammonia water is then gently poured over the mixture; if acetone is present, a magenta ring forms at the line of contact; tablets containing sodium nitroprusside and alkali are now more commonly used. (05 Mar 2000) |
| achievement test | A standardised test used to measure acquired learning, e.g., competence in a specific subject area such as reading or arithmetic, in contrast to an intelligence test which is a useful index of potential ability or learning. (05 Mar 2000) |