Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to yesterday 's examination , there is slight increase of interstitial lung markings compatible with minimally increased pulmonary edema . A left - sided PICC now terminates at the level of the lower SVC . There is otherwise no significant change compared to yesterday 's examination with redemonstration of large bilateral hilar masses , a patent - appearing left mainstem bronchial stent as well as retrocardiac atelectasis . Persistent asymmetric opacification of the left lung is of unclear etiology .
    OUTPUT:
    
1 . Slight progression of mild pulmonary edema with persistent left basal atelectasis . 2 . Asymmetric opacification of the left lung of unclear etiology with density similar to layering effusion . Conventional lateral views may be helpful if the patient can tolerate transport .