Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is left basilar atelectasis . Prominence of the interstitial markings bilaterally suggests component of interstitial edema . The cardiac and mediastinal silhouettes are unremarkable . The aortic knob is calcified . Previously seen right PICC is no longer seen . Old right - sided rib fracture is again noted .
    OUTPUT:
    
Left basilar atelectasis . Possible mild interstitial edema .