Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is upper limits of normal in size allowing for AP technique . Pulmonary vascularity is normal . An area of increased opacity overlies the spine on the lateral view , and could be located within either or both posterior basilar segments of the lower lobes , as there are also subtle areas of opacity in the retrocardiac regions bilaterally on the frontal view . Small pleural effusions are also demonstrated .
    OUTPUT:
    
Increased opacity overlying the lower thoracic spine , which may represent aspiration , atelectasis or developing pneumonia in one or both posterior basilar segments of the lower lobes . Short - term followup radiographs may be helpful in this regard .