Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is not enlarged . Mild prominence the main pulmonary artery is within normal limits . There is slight upper zone redistribution , but no overt CHF . No focal infiltrate , effusion , or gross pneumothorax is detected . Lateral view suggest possible minimal blunting of both costophrenic angles . No free air seen beneath the diaphragm .
    OUTPUT:
    
No focal infiltrate to suggest pneumonia . No overt CHF . Possible minimal blunting of the costophrenic angles posteriorly .