Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The interstitial markings are prominent , consistent with mild vascular congestion . Evaluation of the lung bases is limited due to underpenetration , though no focal opacity is identified . There is no pleural effusion or pneumothorax . The known nodule in the right upper lobe is likely obscured by overlying ribs on today 's exam . The mediastinal contours are normal . The heart size is mildly enlarged , and unchanged .
    OUTPUT:
    
Mild vascular congestion .