Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small linear opacity in the left lower lung base , unchanged since ___ , likely due to scarring . There is no focal consolidation , pleural effusion , or pneumothorax . The heart demonstrates left ventricular configuration and the aorta is tortuous , findings that may accompany systemic hypertension . A coronary stent is noted .
    OUTPUT:
    
No evidence of pneumonia .