Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and hila are stable and within normal limits . Subtle right middle lobe airspace opacity is new from the prior exam , possibly atelectasis . Otherwise , the lungs are grossly clear , without focal infiltrate or consolidation . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or sizable pleural effusion .
    OUTPUT:
    
Hazy right middle lobe airspace opacity may simply represent atelectasis , however developing infection should be considered in appropriate clinical setting . Otherwise , lungs are grossly clear .