Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Bibasilar atelectasis is noted . There is no consolidation concerning for pneumonia . No edema or congestion . No large effusion or pneumothorax . Heart size appears grossly within normal limits . There is a subtle retrocardiac opacity which could represent a hiatal hernia . Mediastinal contours unremarkable . Bony structures are intact .
    OUTPUT:
    
Bibasilar atelectasis . Retrocardiac opacity , likely hiatal hernia .