[Tamponade caused by subacute pericarditis in Basedow's disease]

No case of cardiac tamponade due to subacute pericarditis in the course of Grave's disease has yet been reported. From the 2 cases presented here it would appear that the association is mere coincidence, the clinical manifestations of the pericarditis being probably aggravated by the hyperthyroidism which facilitates the development of oedema and serous effusions.