Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left basilar opacity on the frontal view likely corresponds to overlying breast tissue , there is no corresponding opacity seen on the lateral view . The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Left lower lobe opacity likely corresponds to overlying dense breast tissue . No acute intrathoracic process detected .