Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Mild elevation of the left hemidiaphragm noted . There is somewhat rounded bilateral infrahilar opacity which has a somewhat unusual appearance for pneumonia or hiatal hernia . No large effusion or pneumothorax . Heart is mildly enlarged though not fully assessed . Mediastinal contour is normal . The hila appear prominent . Bony structures are intact .
    OUTPUT:
    
Bilateral infrahilar rounded opacity , incompletely characterized ; chest CT recommended to further assess .