Thrombocytopenia occurs in all except:
Answer is A (Henoch Schonlein I'urpura) 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'.
Henoch schonlein purpura
TTP
DIC
Wiskott Aldrich syndrome