Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate - to - severe cardiomegaly is unchanged . Hilar engorgement is indicative of fluid overload along with patchy scattered increased reticulation compatible with moderate pulmonary edema . Linear retrocardiac densities are similar to prior exam . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Moderate pulmonary edema . Infection can not be excluded given the appropriate clinical circumstance , particularly with slightly more prominent retrocardiac opacity .