MRCP UK EXAMINATIONS

Detailed explanation-1: -The best known collateral vessels in coarctation of the aorta and occlusion of the subclavian artery are internal thoracic and parascapular arteries that connect the high-pressure proximal system to the low-pressure vessels distal to the obstruction via dilated intercostal arteries.

Detailed explanation-2: -Collateral vessels are small blood vessels that connect the aorta (the major vessel carrying oxygen-rich blood from the heart to the rest of the body) and the main pulmonary artery (carrying oxygen-depleted blood from heart to lungs).

Detailed explanation-3: -Coarctation of the aorta can affect any part of the aorta, but it’s most often located near a blood vessel called the ductus arteriosus. That blood vessel connects the left pulmonary artery to the aorta.

Detailed explanation-4: -Preductal coarctation results when an intracardiac anomaly during fetal life decreases blood flow through the left side of the heart, leading to hypoplastic development of the aorta. This is the type seen in approximately 5% of infants with Turner syndrome.