Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The size of the heart is difficult to assess owing to low lung volumes and overlapping soft tissue contours . The aorta is moderately tortuous with calcification along the arch . There is suggestion of mild central congestion but no focal opacification . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Findings suggest mild vascular congestion . No evidence of pneumonia .