Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are intact and aligned . The patient has had previous aortic valve replacement . Bilateral pigtail catheters remain in place . A right PICC line terminates in the low SVC . A feeding tube terminates in the distal stomach . The small left pleural effusion has decreased , and the right pleural effusion is trace at best . Associated retrocardiac airspace opacification is most likely due to left lower lobe collapse . A small left apical pneumothorax has substantially decreased . A combination of perihilar atelectasis and pulmonary edema contributes to persistent bilateral perihilar airspace opacities . Left lower lobe retrocardiac opacification is likely due to persistent atelectasis .
    OUTPUT:
    
Decreased small left pleural effusion . Minimal right pleural effusion not appreciably changed . Substantially improved left apical pneumothorax . Stable left lower lobe collapse .