Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . There is an ill - defined opacity in the right infrahilar region . There is no effusion or pneumothorax . Cardiac and mediastinal contours are normal . Convex right scoliosis is mild .
    OUTPUT:
    
No definite pneumonia . Subtle right infrahilar opacity is likely due to summation of vessels and rib , but short - term follow up CXR may be helpful to exclude early pneumonia if there are infectious symptoms .