Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear except for linear opacities at the left lung base . . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Asymmetry of the breasts contours and surgical clips in the left axilla are consistent with previous at history of breast cancer .
    OUTPUT:
    
No evidence of active pulmonary infection .