Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes causes bronchovascular crowding . There is no effusion or pneumothorax . Hazy right perihilar opacity may represent pneumonia . The cardiomediastinal silhouette is normal . Healing distal right clavicle fracture is again seen . Imaged osseous structures are otherwise intact . No free air below the right hemidiaphragm is seen . Metallic density at the right anterior chest may be exterior to the patient .
    OUTPUT:
    
Hazy right perihilar opacity may represent right upper lobe pneumonia .