The CRST syndrome (calcinosis, Raynaud's phenomenon, sclerodactyly and telangiectasia).

The CRST syndrome is defined, and its relation to systemic sclerosis described. The literature referring to the condition is reviewed and a further case reported. Clinical and diagnostic features of the telangiectasia are emphasised, particularly in comparison with those of the similar condition, hereditary haemorrhagic telangiectasia.