Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . New subtle opacity at the right lung base in the setting of similar lung volumes with increased opacity on the lateral view may be atelectasis , but could represent early or developing pneumonia in the appropriate clinical setting . Cardiac and mediastinal silhouettes are normal . No acute osseous abnormality is identified .
    OUTPUT:
    
Right basilar opacity is probably atelectasis , but could represent early or developing pneumonia in the appropriate clinical setting .