Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The lungs are well expanded . There is a mild interstitial pattern of opacities . There is no focal consolidation , effusion , pneumothorax . Cardiomegaly is severe . There aorta is tortuous .
    OUTPUT:
    
Mild interstitial opacity of unknown chronicity