Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is limited owing to low lung volumes and positioning . Allowing for these limitations , again noted is elevation of the right hemidiaphragm which suggests subpulmonic effusion . Otherwise , the visualized lungs do not show any focal opacities . Cardiac size can not be properly assessed due to obscuring of the right heart border , but is not significantly changed compared with prior study . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Right lateral decubitus radiograph suggested to evaluate for subpulmonic effusion given discrepance between right hemidiaphragm elevation compared to prior .