Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The heart remains markedly enlarged . There is mild pulmonary edema . The retrocardiac gas filled structure likely reflects known hiatal hernia . Small bilateral pleural effusions are likely present . There is left basal atelectasis . No pneumothorax . Mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
Marked cardiomegaly with mild pulmonary edema and small bilateral pleural effusions . Left lower lobe atelectasis also noted . Hiatal hernia noted .