[Acrocyanosis: certain paradoxes, its pathogenesis].

First described by Crocq (1896) the clinical pattern of acrocyanosis is well known and its diagnosis is easy but acrocyanosis is a nosological frame with multiple aspects and a constitutional basis of microvasculotissular dysregulation. Acrocyanosis is made of capillarovenular hypotonia and stasis with a large and permanent opening of arteriovenous glomic anastomosis.