Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Respiratory motion slightly limits evaluation of this exam . The heart size appears mildly enlarged . Mediastinal contours are somewhat prominent , but this likely is accentuated by the low lung volumes . There is crowding of the bronchovascular structures . No overt pulmonary edema , pleural effusion , or pneumothorax is identified . Streaky opacities in the perihilar regions may reflect atelectasis . There is no acute osseous abnormality .
    OUTPUT:
    
Limited study due to respiratory motion and low lung volumes . No overt pulmonary edema identified . Probably bilateral perihilar atelectasis .