Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , lung volumes remain normal . Lungs are clear . As before , there may be a small right pleural effusion with blunting of the right costophrenic angle . No pneumothorax . Heart size is normal and unchanged . Mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . Again seen are surgical clips within the left upper quadrant reflective of prior splenectomy .
    OUTPUT:
    
No acute intrathoracic abnormality . Possible small right pleural effusion , unchanged .