Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate diffuse interstitial abnormality suggesting pulmonary vascular congestion . Otherwise , the lungs appear clear . There is no pleural effusion or pneumothorax . Mild - to - moderate relative elevation of the left hemidiaphragm compared to the right appears unchanged . The heart is mildly enlarged . The aortic arch is calcified . The mediastinal and hilar contours appear unchanged . Degenerative changes are similar along the thoracic spine . Surgical clips project along the upper abdomen .
    OUTPUT:
    
Moderate interstitial abnormality most suggestive of pulmonary vascular congestion .