Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is enlarged . Hilar and mediastinal contours are normal . No abnormalities are seen within the right apical region . There might be a small right - sided pleural effusion . The lungs are otherwise well expanded and clear . There is no pneumothorax . The left sided pacemaker leads terminate in the right atrium and right ventricle , expected locations . The osseous structures are unremarkable .
    OUTPUT:
    
Probable small right - sided pleural effusion .