Interrupted aortic arch- type B1

Case contributed by Mohamed Saber


Respiratory distress

Patient Data

Age: 4 months
Gender: Female

There is an interruption of the aortic arch between the left common carotid and left subclavian arteries. Normal right subclavian artery. The left subclavian artery emanates from the proximal descending aorta which arises from the main pulmonary artery via a patent ductus arteriosus. Slight mesocardia with mild right atrial and right ventricular dilatation and the enlarged main pulmonary trunk is larger than the aorta

Hypovoluminous ,totally non-aerated/ consolidated left lung. There is also diffuse ground-glass density of the right lung with multiple patchy areas of consolidation more prominent basally. Bilateral pulmonary plethora

Annotated image

Annotated selected images of 3D CT study highlight the abnormality

Case Discussion

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

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