Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large subpulmonic effusion is present on the right with associated atelectasis . The heart size is at the upper limits of normal and the visualized mediastinal and hilar contours are within normal limits . The left lung is clear . There is no pneumothorax . Two locules of gas in the left upper abdomen represent the gastric bubble and splenic flexure of the colon .
    OUTPUT:
    
Large right pleural effusion with associated atelectasis .