Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is in unchanged position . Left PICC terminates in upper SVC . Transesophageal tube has been removed . Descending thoracic aorta stent graft is stable . Sternotomy wires are intact . Bibasilar opacities have improved , likely reflecting improved atelectasis . Moderately enlarged cardiac silhouette and is unchanged . There is no pulmonary edema .
    OUTPUT:
    
Improved bibasilar atelectasis . No pulmonary edema .