Abstract:
True subclavian artery aneurysm (SAA) is a rare type of peripheral
artery aneurysm. Thoracic outlet syndrome and atherosclerosis are
the most common etiological factors [1]. Halsted [2] explained the
poststenotic dilatation and the aneurysm development to be a result
of turbulent flow near the narrowing and low blood pressure distal
to the stenosis.
The famous concept of “yin-yang” which represents a balance
and equilibrium between good and evil is a classical Doppler sign
of pseudoaneurysms. Mural thrombus in the SAA may also cause
this appearance on contrast-enhanced CT (CECT) examination. In
this report a case of true SAA due to a cervical rib and yin-yang
appearance on CECT is presented.
