Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and prosthetic cardiac valve noted . There is an aortic stent visualized in the upper abdomen . The heart is moderately enlarged . The aorta is markedly unfolded . There is no focal consolidation , large effusion or pneumothorax . No convincing signs of congestion or edema . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Cardiomegaly with unfolded thoracic aorta . No signs of pneumonia or edema .