Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs again demonstrate an enlarged cardiac silhouette , unchanged . There is increased vascular congestion and diffuse interstitial opacity . No focal consolidation is seen . There is no pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable . Calcifications are again seen within the thoracic aorta and within the expected location of the carotid arteries .
    OUTPUT:
    
Diffuse interstitial opacities are likely due to interstitial edema and less likely atypical pneumonia . No focal consolidation to suggest bacterial pneumonia .