Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal patchy opacity is noted within the left lower lobe . A trace left pleural effusion may be present as there appears to be blunting of the posterior left costophrenic sulcus . No focal consolidation or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal patchy left lower lobe opacity is worrisome for pneumonia . Possible trace left pleural effusion .