Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple displaced left lower rib fractures and nondisplaced right lower rib fractures again noted . Bilateral lower lobe opacification shows mild interval progression . Suspected small associated effusions . Heart size is unchanged . No pulmonary edema . Endotracheal tube in situ with the tip 52 mm proximal to the carina . NG tube in situ with the tip in the stomach .
    OUTPUT:
    
Mild interval progression of the bilateral lower lobe opacification most likely representing atelectasis .