Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . Subtle , small , symmetric opacities overlying the lower lungs on the frontal projection may represent nipple shadows . Otherwise , there is no focal consolidation , pleural effusion or pneumothorax is identified . Bony structures are intact . No free air below the right hemidiaphragm seen .
    OUTPUT:
    
No acute intrathoracic process . As detailed above , nipple shadows likely account for nodular opacities projecting over the lower lungs bilaterally . This can be confirmed with repeat utilizing nipple markers .