Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged with a left ventricular configuration . The mediastinal and hilar contours appear unchanged . The lungs appear clear . Blunting of the right posterior costophrenic sulcus may reflect a trace pleural effusion on that side only . Mild degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
Possible trace right - sided pleural effusion ; otherwise unremarkable .