Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small to moderate right effusion . Slight asymmetry of right hilus may reflect enlarged pulmonary artery or adenopathy . The lungs are otherwise clear . The heart is not enlarged . No pneumothorax .
    OUTPUT:
    
Right pleural effusion and asymmetry of right hilus , in this clinical context may reflect pulmonary embolism or central lesion with effusion . A CTA thorax is suggested .