Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vascularity is normal . 2 .6 cm rounded opacity projecting in the left lung base is noted , likely within the left lower lobe . The lungs are hyperinflated . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
2 .6 cm left lower lobe rounded opacity concerning for a mass lesion . Further evaluation with CT with contrast is recommended . Hyperinflated lungs suggestive of COPD .