Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views were obtained of the chest . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . Mild enlargement of the previously top normal cardiac silhouette has developed since ___ , but there is no vascular engorgement , edema , or pleural effusion . Previously described right lower lobe opacity appears to have decreased in conspicuity .
    OUTPUT:
    
New mild cardiomegaly and or pericardial effusion ; no other findings of cardiac decompensation or tamponade physiology .