| haemamoebiasis | Any infection with ameboid forms of parasites in red blood cells, as in malaria. (05 Mar 2000) |
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| haemanalysis | Analysis of the blood and its components. (09 Oct 1997) |
| haemangiectasis | Haemangiectasia Dilation of blood vessels. Origin: G. Haima, blood, + angeion, vessel, + ektasis, a stretching (05 Mar 2000) |
| haemangiectatic hypertrophy | <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) |
| haemangio- | The blood vessels. Origin: G. Haima, blood, + angeion, vessel (05 Mar 2000) |
| haemangioblast | <haematology> Earliest mesodermal precursor of both blood and vascular endothelial cells. Described in embryonic yolk sac blood islands of birds. (18 Nov 1997) |
| haemangioblastoma | <oncology, tumour> A haemangioma, or type of tumour composed of blood vessel or angioblast cells, which occurs in the brain. (09 Oct 1997) |
| haemangioendothelioblastoma | <oncology, tumour> A tumour which is formed from endothelial cells and which tends to line the inside surfaces of blood vessels. It arises in embryonic connective tissue (the mesenchyme). (09 Oct 1997) |
| haemangioendothelioma | <oncology, tumour> A tumour which comes from endothelial cells lining the inside surfaces of blood vessels. (09 Oct 1997) |
| haemangioendothelioma tuberosum multiplex | An eruption of pinkish papules, caused by hyperplasia of the endothelium of the superficial blood vessels. (05 Mar 2000) |
| haemangioendothelioma, epithelioid | A tumour of medium-to-large veins, composed of plump-to-spindled endothelial cells that bulge into vascular spaces in a tombstone-like fashion. These tumours are thought to have "borderline" aggression, where one-third develop local recurrences, but only rarely metastasize. It is unclear whether the epithelioid haemangioendothelioma is truly neoplastic or an exuberant tissue reaction, nor is it clear if this is equivalent to kimura's disease (see angiolymphoid hyperplasia with eosinophilia). (12 Dec 1998) |
| haemangiofibroma | A haemangioma with an abundant fibrous tissue framework. (05 Mar 2000) |
| haemangioma | <cardiology, dermatology, embryology, physiology> A haemangioma or arteriovenous malformation is a tangle of abnormal vessels that forms an abnormal communication between the arterial and venous systems. most are congenital and result from improperly formed angioblastic tissue in the foetus. If large enough, they may produce a shunt of sufficient magnitude to raise the cardiac output. Arteriovenous malformations may occur in the brain, brainstem and spinal cord, where they may cause headaches, seizures or bleeding (subarachnoid haemorrhage). Red or purple-coloured vascular skin markings that develop shortly after birth. most are usually painless and benign. Some lesions (cavernous haemangiomas) will disappear or become harder to see as the child approaches school age. Localised steroid injections have been used successfully to reduce the size of a birthmark. (18 Nov 1997) |
| haemangioma of bone | <radiology> Lytic bone lesion, can cross joint spaces and interosseous membranes Findings: vertebral body: vertical striations (ivory), skull: sunburst or sunrise, long bone: soap bubble or honeycomb, which may surround a joint see also: Mafucci syndrome (12 Dec 1998) |
| haemangioma of vertebrae | <radiology> Cavernous type commonly found, 10% in autopsy series with the vast majority being small, asymptomatic and unable to be seen on plain films, most often in lumbar region and singular, complications: compression fractures (occasionally with cord compression), chronic haemorrhage to blockage of spinal canal X-ray: slight loss of density of vertebral body, vertically striped orientation of bone trabeculae (corduroy cloth) which may extend into the pedicle, occasionally with posterior bulging, cortical margins usually intact see also: haemangioma of bone (12 Dec 1998) |
| haema | the formation of blood cells in the living body (especially in the bone marrow) |
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| haema | pertaining to the formation of blood or blood cells |
| haema | small genus of tropical American spiny bushy shrubs or trees |
| haema | small genus of tropical American spiny bushy shrubs or trees |
| haema | spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye |
| haema | the presence of blood in the urine |