Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate - to - severe cardiomegaly appears relatively unchanged compared to the prior exam . Mild pulmonary edema is present , slightly improved compared to the prior study . Ill - defined opacities in the lung bases may reflect compressive atelectasis though infection is difficult to exclude . Small pleural effusions are noted bilaterally . No pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild congestive heart failure , improved when compared to the prior study , with small bilateral pleural effusions . Ill - defined opacities at lung bases may reflect compressive atelectasis though infection is difficult to exclude .