Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views of the chest demonstrate clear lungs . The cardiac , mediastinal , and hilar contours are normal . There has been interval removal of a right PICC . No pneumothorax or pleural effusion . A left mainstem bronchus endobronchial stent is visualized .
    OUTPUT:
    
No evidence of infection .