Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is streaky retrocardiac opacity . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified . Left clavicular orthopedic hardware is identified .
    OUTPUT:
    
Streaky retrocardiac opacity , potentially atelectasis . Clinical correlation regarding the possibility of infection .