Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right pleural effusion has substantially improved with only a small residual effusion remaining . Heart size , mediastinal and hilar contours are normal . Lungs are clear except for a small calcified granuloma within the lingula . No acute skeletal abnormalities .
    OUTPUT:
    
Marked interval improvement of right pleural effusion with small residual effusion remaining .