Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mediastinal and hilar contours are unremarkable . A moderate to large right pleural effusion is noted with right basilar patchy opacity likely reflective of compressive atelectasis . Minimal left basilar atelectasis is also noted . There is crowding of the bronchovascular structures , with possible mild pulmonary vascular congestion . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate to large right pleural effusion with right basilar patchy opacity most likely reflective of compressive atelectasis but infection can not be completely excluded . Mild pulmonary vascular congestion .