Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . There is minimal atelectasis in the left lung base . No focal consolidation or pneumothorax is seen . There is blunting of the left costophrenic angle which may suggest a trace left pleural effusion . There is no acute osseous abnormalities .
    OUTPUT:
    
Minimal atelectasis in the left lung base and possible small left pleural effusion .