Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . Elevation of the right hemidiaphragm is unchanged . Streaky opacities in the lung bases likely reflect areas of atelectasis . Minimal blunting of the left costophrenic sulcus may suggest the presence of a tiny left pleural effusion . No pneumothorax is present . There are no acute osseous abnormalities . A remote fracture of the left fifth lateral rib is noted . Left subdiaphragmatic lucency is concerning for pneumoperitoneum .
    OUTPUT:
    
Pneumoperitoneum . Bibasilar atelectasis . Possible trace left pleural effusion . A subsequent CT of the abdomen and pelvis has already been obtained at this time .