Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . A focal opacity at the right lung base is unchanged since ___ and represents pericardial fat . There is no pneumothorax , new effusion , or focal consolidation detected . The central pulmonary vessels are engorged ; however , there is no overt edema .
    OUTPUT:
    
No acute intrathoracic process .