Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . Crowding of the pulmonary vasculature is likely secondary to low lung volumes . Lungs are clear . Moderate right pleural effusion . No left pleural effusion . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate right pleural effusion .