Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine frontal radiograph of the chest was reviewed . The heart size is normal . Mediastinal and hilar contours are unremarkable . Leftward shift of the heart with elevation of the left hemidiaphragm is indicative of left lower lobe atelectasis . Interstitial prominence may be chronic or indicative of mild pulmonary edema . There is no pneumothorax . Median sternotomy wires and CABG clips are noted . Prominence of the left first rib costosternal junction is noted .
    OUTPUT:
    
1 . Left lower lobe atelectasis . 1 . Mild edema or chronic interstitial parenchymal abnormality . 2 . Prominence of the left 1st rib costosternal junction . Clinical correlation with focal tenderness in this location is recommended .