Definition: a subacute, granulomatous arteritis involving the external carotid arteries, especially the temporal artery; occurs in old people and may be manifested by constitutional symptoms, particularly severe headache, and sometimes sudden unilateral blindness. Erythrocyte sedimentation rate is always elevated. Shares many of the symptoms of polymyalgia rheumatica.
Synonym(s): cranial arteritis, extracranial arteritis, giant cell arteritis, granulomatous arteritis, Horton arteritis
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