Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Midline sternotomy closure device again noted . The heart is stably enlarged and the mediastinal contour is markedly unfolded and widened in this patient with known history of aortic dissection . There is no focal consolidation , large effusion or pneumothorax . No evidence of pulmonary edema . Bony structures are intact .
    OUTPUT:
    
Cardiomegaly with stable prominence of the mediastinum in this patient with known aortic dissection status post repair . No superimposed edema or pneumonia .