The posterior basal segment of the left lower lobe is hyperlucent and shows distal air trapping compared to the rest of the lung. A broncholith is seen within. The overall appearance is suggestive of segmental bronchial atresia.
This segment of the lung is supplied by an aberrant systemic artery arising from the coeliac axis at T12 vertebral level. Its diameter is 7 mm. In addition to that, normal pulmonary arterial supply, as well as normal pulmonary venous drainage of the left lower lobe is demonstrated.
The rest of both lungs show paraseptal, panacinar emphysematous changes with few apical subpleural bullae.
No evidence of pulmonary hypertension or cardiomegaly.