Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There has been interval placement of a nasogastric tube which courses into the left upper abdomen with the tip outside the field of view . There is a catheter projecting over the right upper quadrant likely a percutaneous biliary drain as seen on recent prior CT abdomen pelvis . There is mild bibasilar atelectasis without definite signs of pneumonia , edema , effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Mild basilar atelectasis .