<prompt> Thrombocytopenia occurs in all except:Henoch schonlein purpuraTTPDICWiskott Aldrich syndrome  <response>: Answer is A Henoch Schonlein Iurpura The mechanism of ecchymosis or purpura in Henoch Schonlein is vasculitis. There is no thrombocytopenia. All other options are known causes of thrombocytopenia. For details on Henoch Shonlein purpura refer the chapter on Connective tissue and metabolism. 