Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged allowing for differences in technique . A patchy opacity in the left lower lung has largely resolved , although a residual component may be associated with slight atelectasis or scarring . More generally there is a diffuse interstitial abnormality suggesting mild - to - moderate pulmonary vascular congestion . A small pleural effusion is suspected on the left and a trace one on the right . Moderate degenerative changes are similar along the lower thoracic spine .
    OUTPUT:
    
Findings suggesting mild - to - moderate pulmonary congestion .