A false aneurysm is a well known complication after catheterisation. It is increasingly seen as a result of the increase of cardiological intervention treatment. In the past the classical treatment was surgery, nowadays a expectative management is the more frequently chosen alternative. A new treatment consists of compression under color Doppler ultrasonography control. This treatment frequently leads to direct thrombosis of the false aneurysm and can be carried out on an outpatient basis.