Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . There is mild upper zone re-distribution of pulmonary vascularity and indistinctness , suggesting slight vascular congestion or fluid overload , although not striking . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild vascular prominence which could be seen with pulmonary venous hypertension or slight congestion .