| FG | fasciculus gracilis; fast-glycolytic [fiber]; Feeley-Gorman [agar]; fibrinogen; Flemish giant [rabbi... |
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| GAN | giant axon neuropathy |
| GCA | gastric cancer area; giant cell arteritis |
| GCN | geometric constraint network; giant cerebral neuron |
| GC(T)A | giant cell (temporal) arteritis |
| low affinity platelet factor IV | Cytokine, produced from platelet basic protein, that acts as a growth factor. (18 Nov 1997) |
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| low platelet count | <haematology> An abnormally low platelet count. Normal platelet counts are 150,000-400,000 per cubic millimetre. Those with low platelet counts may exhibit haematuria, haematemesis, easy bruising, bleeding gums, melena (blood in stools), prolonged menses or nosebleeds. Spontaneous intracranial haemorrhage can occur with platelet counts of 10-15,000 (or less). (27 Sep 1997) |
| benign giant lymph node hyperplasia | Solitary masses of lymphoid tissue containing concentric perivascular aggregates of lymphocytes, occurring usually in the mediastinum or hilar region of young adults; similar changes have been reported outside the mediastinum and, if associated with interfollicular sheets of plasma cells, may progress to lymphoma or plasmacytoma. Synonym: angiofollicular mediastinal lymph node hyperplasia, Castleman's disease. (05 Mar 2000) |
| carcinoma, giant cell | An epithelial neoplasm characterised by unusually large anaplastic cells. It is highly malignant with fulminant clinical course, bizarre histologic appearance and poor prognosis. It is most common in the lung and thyroid. (12 Dec 1998) |
| malignant giant cell tumour | A type of bone tumour. (12 Dec 1998) |
| giant | 1. A man of extraordinari bulk and stature. "Giants of mighty bone and bold emprise." 2. A person of extraordinary strength or powers, bodily or intellectual. 3. Any animal, plant, or thing, of extraordinary size or power. Giant's Causeway, a vast collection of basaltic pillars, in the county of Antrim on the northern coast of Ireland. Origin: OE. Giant, geant, geaunt, OF. Jaiant, geant, F. Geant, L. Gigas, fr. Gr, from the root of E. Gender, genesis. See Gender, and cf. Gigantic. Like a giant; extraordinary in size, strength, or power; as, giant brothers; a giant son. Giant cell. <anatomy> A very large African heron (Ardeomega goliath). It is the largest heron known. Giant kettle, a pothole of very large dimensions, as found in Norway in connection with glaciers. See Pothole. Giant powder. See Nitroglycerin. <botany> Giant puffball, one of several species of very large squids, belonging to Architeuthis and allied genera. Some are over forty feet long. Source: Websters Dictionary (01 Mar 1998) |
| giant axon | <biology> Extraordinarily large unmyelinated axons found in invertebrates. Some, like the squid giant axon, can approach 1 mm diameter. Large axons have high conduction speeds, the giant axons are invariably involved in panic or escape responses and may (e.g. Crayfish) have electrical synapses to further increase speed. Vertebrate axons with high conduction velocites are much narrower: they are myelinated, allowing saltatory conduction. (17 Dec 1997) |
| giant axonal neuropathy | <paediatrics> A rare disorder beginning at or after the third year of life, and presenting clinically with kinky hair, progressive painless clumsiness, muscle weakness and atrophy, sensory loss, and areflexia. Pathologically, both myelinated and unmyelinated nerve fibres contain axonal spheroids packed with neurofilaments; sporadic in nature. (05 Mar 2000) |
| giant cell | <pathology> A cell of large size, often with many nuclei. They are multinucleated masses produced by the fusion of many cells. They are often associated with viral infections. In AIDS, they are induced when the envelope glycoprotein of HIV binds to the CD4 antigen of uninfected neighboring T4 cells. The resulting syncytium leads to cell death and thus may account for the cytopathic effect of the virus. (18 Jul 2002) |
| giant cell aortitis | <pathology> Giant cell arteritis involving the aorta. (05 Mar 2000) |
| giant cell arteritis | <pathology> An inflammatory condition of the temporal artery. It is a serious chronic vascular disease, characterised by inflammation of the walls of the blood vessels (vasculitis). The age of affected patients is usually over 50 years of age. It most often involves the carotid artery system, and can lead to blindness or stroke. It can be diagnosed by biopsy of an artery, but there is often a false negative result. Elevation of the erythrocyte sedimentation rate is typical. Treatment is with high dose steroids. Common symptoms include headaches and tenderness over the temple (temporal artery). Can be associated with polymyalgia rheumatica. See: polymyalgia rheumatica. Synonym: cranial arteritis, temporal arteritis (20 Jun 2000) |
| giant cell astrocytoma | <radiology> Malignant transformation from hamartoma (tuber) of tuberous sclerosis, enhances (unlike benign lesions), arises only about foramen of Monro, not really an astrocytoma, it's a giant-cell tumour (12 Dec 1998) |
| giant cell carcinoma | <tumour> A malignant epithelial neoplasm characterised by unusually large anaplastic cells. (05 Mar 2000) |
| giant cell carcinoma of thyroid gland | A rapidly progressive undifferentiated carcinoma observed in the thyroid gland, characterised by numerous, unusually large, anaplastic cells derived from glandular epithelium of the thyroid gland. (05 Mar 2000) |
| giant cell epulis | <dermatology, oncology> A non-neoplastic lesion characterised by a proliferation of granulation tissue containing numerous multinucleated giant cells. It occurs on the gingiva and alveolar mucosa (occasionally on other soft tissues) where it presents as a soft red-blue haemorrhagic nodular swelling. It also occurs within the mandible or maxilla as a unilocular or multilocular radiolucency. Peripheral giant cell granuloma refers to the gingiva (giant cell epulis), central refers to the jaw. Microscopically similar lesions occur in the tubular bones of the hands and feet, are considered neoplastic, and may have a malignant course. Identical bony lesions may be seen in hyperparathyroidism and cherubism. See: giant cell tumour of bone. Synonym: giant cell epulis. (05 Mar 2000) |