Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small to moderate left pleural effusion is present with adjacent left lower lobe opacity . Mild streaky opacity in the righ lung base is also noted . No right pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Small to moderate size left pleural effusion with adjacent left lower lobe opacity , possibly compressive atelectasis but pneumonia is not excluded . Mild right basilar atelectasis .