Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Midline sternotomy wires and mediastinal clips are again noted . There is a coronary stent projecting over the heart . Lung volumes are low limiting assessment . There is pulmonary vascular congestion and probable mild interstitial edema . Bilateral pleural effusions are present , left greater than right . Retrocardiac opacity is also noted which could reflect atelectasis and / or pneumonia . No pneumothorax . Bony structures are intact . Heart size remains mildly enlarged . Mediastinal contour is normal .
    OUTPUT:
    
Cardiomegaly , pulmonary vascular congestion and mild edema with bilateral effusions left greater than right . Retrocardiac opacity is concerning for atelectasis and / or pneumonia .