Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . The bilateral hila are enlarged and indistinct . The cardiac silhouette has enlarged . There is a prominent opacity in the azygos contour . The lungs are clear without focal consolidation , effusion , or pneumothorax .
    OUTPUT:
    
Mild - to - moderate central pulmonary vascular congestion and cardiomegaly . Prominence of the azygos vein suggests right heart failure . Findings were discussed via telephone with ___ at approximately 4 p .m . on ___ .