Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . Faint opacity in the right costophrenic angle is seen only on the AP view . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . The cardiac , hilar , and mediastinal contours are normal .
    OUTPUT:
    
Equivocal opacity in the right costophrenic sulcus could represent pneumonia in the proper clinical setting .