<unk>  is a localized narrowing or abrupt constriction of the aortic arch anywhere along its length. It is most common distal to the origin of the left subclavian artery, near the area where the ductus arteriosus (ligamentum arteriosum after its regression) inserts. Less commonly, the obstruction can occur in the abdominal aorta. <unk> rctation may be associated with a bicuspid aortic valve.
There is a dilation of the aorta immediately above the narrowing, but especially just below. Therefore the latin term<unk> rctatus, which means contracted or tightened.
Aortic coarctation
Annuloaortic ectasia
Aortic sclerosis
Bicuspid aortic stenosis
Aortic stenosis
Pulmonary vein stenosis
Interrupted aortic arch
Ductus arteriosus aneurysm