Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate to large right pleural effusion is present . Compressive right basilar atelectasis is also demonstrated . Heart size is difficult to assess given the presence of this effusion . Mediastinal and hilar contours are unremarkable . Left lung is clear . No left - sided pleural effusion is present . No pneumothorax or pulmonary vascular congestion is seen . The osseous structures are unremarkable .
    OUTPUT:
    
Moderate to large right pleural effusion with right basilar atelectasis .