Interrupted aortic arch is a congenital cardiovascular anomaly where there is a separation between the ascending and descending aorta.

It is classified into three types:

• type A: interruption occurs distal to the left subclavian arterial origin 
• type B: interruption occurs between the left common carotid and left subclavian arterial origins
• type C: interruption occurs proximal to the left common carotid arterial origin

Each type is divided into three subtypes:

• subtype 1: normal subclavian artery
• subtype 2: aberrant subclavian artery
• subtype 3: an isolated subclavian artery that arises from the ductus arteriosus