Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A vague opacity persists at the right lung base . This may represent pneumonia versus atelectasis . There is subtle retrocardiac opacity as well . Lungs are otherwise clear without effusion or pneumothorax . The cardiomediastinal silhouette is stable . Imaged osseous structures are intact . No free air is seen below the right hemidiaphragm . Clips in the right upper quadrant noted .
    OUTPUT:
    
1 . Opacity in the right and left lung base could represent pneumonia . Followup to resolution advised . 2 . No free air below the right hemidiaphragm .