Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views the chest provided . A retrocardiac gas filled structure likely represent a hiatal hernia , unchanged from prior . Lungs are clear without focal consolidation , large effusion or pneumothorax . The heart and mediastinal contours are stable and normal . Stable appearance of right AC joint separation . Coarse calcification is seen projecting over the left scapula unchanged from prior CT . Otherwise bony structures appear unremarkable .
    OUTPUT:
    
Hiatal hernia . No pneumonia .