Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal , with heart in the upper limits of normal . The right lung is well expanded and clear . In the left lung base , there is a peripheral opacity in the left lower lobe , could represent atelectasis ; however , in the setting of acute pleuritic chest pain , this would be concerning for pulmonary embolism with infarction . Trace left pleural effusion is present . There is no pulmonary edema .
    OUTPUT:
    
Small left effusion with a peripheral left lower lobe opacity , may represent atelectasis or pulmonary infarction , especially given the history of left - sided pleuritic chest pain . CTA is recommended for further evaluation .