Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are mildly hyperinflated . A heterogeneous airspace opacity is seen on the lateral view in the upper lung does not have a clear correlate on the frontal view . Cardiomediastinal and hilar contours are unremarkable . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Heterogeneous opacity in the upper lung on the lateral view does not have a clear correlate on the frontal view . While this may represent atelectasis , if the patient 's symptoms persist , a repeat chest x-ray should be performed to evaluate for the presence of pneumonia .