Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly and aortic knob calcifications are unchanged . Mild vascular congestion . Linear opacities in the bilateral lower lobes are unchanged over multiple prior studies . There is no consolidation , pneumothorax or pleural effusion .
    OUTPUT:
    
Mild vascular congestion . No focal opacity concerning for pneumonia .