Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires again noted . There are scattered areas of platelike atelectasis in the mid to lower lungs . Retrocardiac opacity is noted in the left lower lobe which is concerning for an early pneumonia . No large effusion or pneumothorax . The cardiomediastinal silhouette is unchanged . Bony structures are intact .
    OUTPUT:
    
Subtle left lower lobe opacity concerning for pneumonia . Lower lung platelike atelectasis .