Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A tracheostomy tube projects over the superior mediastinum . Since the prior exam , there is mild increase in pulmonary vascular congestion and development of mild pulmonary edema . No large effusion or pneumothorax . Mild cardiomegaly is stable . Mediastinal contour is unchanged . No pneumothorax or effusion . Bony structures are intact .
    OUTPUT:
    
Interval development of mild pulmonary edema .