Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Since the prior exam , there is apparent progression of pulmonary edema . Interval increase in lower lung opacities raises concern for pneumonia versus aspiration . Cardiomegaly is unchanged with subtle retrocardiac opacity which is consistent with known hiatal hernia . No pneumothorax .
    OUTPUT:
    
Apparent worsening of pulmonary edema . Difficult to exclude a superimposed pneumonia or aspiration at the lung bases .