Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . A subtle linear lucency in the undersurface of the medial portion of the right hemidiaphragm is seen . raises concern for pneumoperitoneum
    OUTPUT:
    
A subtle linear lucency in the undersurface of the medial portion of the right hemidiaphragm is equivocal but raises concern for pneumoperitoneum . At 10 :30 AM , prior to report approval , a repeat upright chest radiograph or a lateral decubitus view was recommmended to the clinical house officer caring for this patient after hospital admission .