Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size appears normal . Aortic knob calcifications are noted . Mediastinal contours are unremarkable . A moderate to large right pleural effusion is demonstrated . Right basilar opacity may reflect compressive atelectasis . Infection is not excluded . Left lung is grossly clear . Pulmonary vasculature is normal . No pneumothorax is seen though assessment of the apices is somewhat obscured by the patient 's neck soft tissues . Multilevel degenerative changes are noted in the thoracic spine with osteophyte formation .
    OUTPUT:
    
Moderate to large right pleural effusion with right basilar opacity likely reflective of atelectasis . Infection is not excluded .