Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volume is low . Mild bibasilar opacities are likely secondary to atelectasis and / or small pleural effusions . Cardiac silhouette is mildly enlarged . The radiograph is labeled as upright , however patient position appears supine or semi upright . Suboptimal patient position limits the evaluation for pneumoperitoneum . Given the limitation , no evidence of large pneumoperitoneum is identified .
    OUTPUT:
    
Bibasilar atelectasis and / or small pleural effusions . No evidence of large pneumoperitoneum is identified . If there is clinical concern for pneumoperitoneum , consider repeat radiograph with upright patient position or CT .