APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Vascular steal is a hemodynamic derangement in which two vascular systems having different levels of pressure/resistance are interconnected by collateral vessels. Blood flow is shunted from the high to low pressure system.

Detailed explanation-2: -Subclavian steal syndrome (SSS), also known as subclavian-vertebral artery steal syndrome, is a phenomenon causing retrograde flow in an ipsilateral vertebral artery due to stenosis or occlusion of the subclavian artery, proximal to the origin of the vertebral artery.

Detailed explanation-3: -Coronary steal is the phenomenon where physiological or pharmacological vasodilation of a myocardial segment’s vasculature is associated with “steal” of blood from another myocardial segment, which is already significantly vasodilated due to the presence of a significant stenosis in a large epicardial artery.

Detailed explanation-4: -It is caused when there is narrowing of the coronary arteries and a coronary vasodilator is used – “stealing” blood away from those parts of the heart. This happens as a result of the narrowed coronary arteries being always maximally dilated to compensate for the decreased upstream blood supply.