Giant cell (temporal) arteritis-polymyalgia rheumatica: a critical review.

Giant cell (temporal) arteritis G.C.(T) A. is common disorder and affects medium sized and large arteries in people over the age of fifty. Many series show that up to 50% of people with the clinical syndrome of polymyalgia rheumatica (PMR) go on to develop manifestations of G.C.(T) A. within a year; others may do so later. A critical review is offered of aspects of the subject which despite much study and research remain controversial or neglected. This includes epidemiology: statistics from routine autopsy suggests that the disease affects more people than are diagnosed clinically. The need to resolve uncertainty whether intracerebral vessels are involved or not, is now urgent, particularly in view of the wide spread use of short courses of Dexamethasone in the treatment of stroke. All clinicians should recognise the implications of the fact that they are dealing with a disease which may be active and yet symptomatically silent.