Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior exam , lung volumes are slightly lower . Streaky linear like opacities in the bilateral lower lungs most likely reflects atelectasis . Additional opacity in the posterior segment of the right lower lobe is not well evaluated in the setting of right hemi diaphragmatic elevation and single portable projection . . No pulmonary edema , pleural effusion , or pneumothorax . Elevation of the right hemidiaphragm is unchanged . The heart is normal in size . The mediastinum is not widened . The patient is slightly rotated . Contiguous old right posterior rib fractures are noted . The ninth posterior rib fracture does not demonstrate significant callus formation .
    OUTPUT:
    
Bibasilar linear atelectasis . Additional opacity in the posterior segment of the right lower lobe is not well evaluated in the setting of diaphragmatic elevation and single portable projection . Standard lateral chest radiograph may be helpful to better assess this region . .