Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . Mild pulmonary vascular congestion and interstitial thickening is present but is unchanged since at least ___ and represents this patient 's baseline . There is no focal opacity . The aorta is tortuous . Cardiac size is top normal . There might be a small left - sided pleural effusion . There is no pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .