Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . There is a small right pleural effusion . Heart size is normal . The mediastinal and hilar contours are unremarkable . Surgical drain and clips project in the abdomen on the lateral radiograph .
    OUTPUT:
    
Small right pleural effusion , new compared to prior exam . No definite evidence of pneumonia .