Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , accentuating the lung markings and the mediastinal silhouette . Moderate cardiomegaly is likely stable . There is bibasilar atelectasis , though underlying infectious process can not be excluded . No pleural effusion or pneumothorax is seen . Osseous structures are grossly unremarkable .
    OUTPUT:
    
1 . Low lung volumes , limiting assessment of the lung parenchyma . However , within these limits , no evidence of pneumothorax . Bibasilar atelectasis , right worse than left , though can not exclude underlying infection . If clinically indicated , repeat chest radiograph with full inspiration would be helpful . 2 . Although no acute fracture or other chest wall lesion is seen , conventional chest radiographs are not sufficient for detection or characterization of most such abnormalities . If the demonstration of trauma to the chest wall is clinically warranted , the location of any referrable focal findings should be clearly marked and imaged with either bone detail radiographs or Chest CT scanning .