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What is abnormal about the left superior mediastinal border?
Double density: there is an oblique structure lateral to the aortic arch.
Aberrant left superior pulmonary vein draining into the left brachiocephalic vein.
A mildly dilated right ventricle and proximal pulmonary arteries.
LIMA to LAD and saphenous vein to PDA grafts.
Left pleural effusion and lower lobe collapse/consolidation.