Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is been prior median sternotomy and coronary bypass surgery . Mild cardiomegaly head is stable , and is accompanied by vascular redistribution and worsening diffuse interstitial edema . Previously reported right lower lobe opacity has slightly improved . Bilateral small pleural effusions have slightly worsened .
    OUTPUT:
    
Congestive heart failure with worsening interstitial edema and slight increase in bilateral pleural effusions . Improving right lower lobe opacity , which may reflect response of pneumonia to interval therapy versus improving region of atelectasis .