Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary artery bypass surgery . Heart size is normal . Hilar contours appear more full compared to baseline study of ___ , and may reflect engorged pulmonary vessels , particularly given the presence of scattered bilateral septal line suggestive of interstitial edema . Bilateral lower lobe opacities reported on the recent study of one day earlier have slightly improved , but a new opacity has developed peripherally at the left base . Residual right infrahilar opacity has a nodular configuration and should be followed to ensure resolution . Bilateral small pleural effusions are also demonstrated . Healed left rib fractures are incidentally noted .
    OUTPUT:
    
1 . Mild CHF with interstitial edema . 2 . Rapidly improving lower lobe opacities could reflect improving edema or aspiration . Continued radiographic followup recommended , particularly to ensure resolution of right infrahilar opacity .