Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is upper zone re-distribution of pulmonary vascularity and minimal prominence of perihilar vascularity , suggesting pulmonary venous hypertension or slight congestion . No focal opacities are demonstrated . The lung volumes are low . There is no pleural effusion or pneumothorax . The patient is status post incompletely characterized lower anterior cervical fusion .
    OUTPUT:
    
Findings suggesting minimal fluid overload ; no focal opacity to suggest pneumonia .