Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited due to poor inspiratory effort and patient positioning . Within this limitation , the lungs are underinflated with resultant bronchovascular crowding . There is increased opacification at the right lung base which is likely due to atelectasis . No significant pleural effusion or pneumothorax is detected . The right hilum appears more dense and rounded than the left but is difficult to assess due to low lung volumes and rightward rotation . The cardiac silhouette is likely within normal limits for size allowing for low lung volumes . The trachea is slightly deviated to the right by the aortic knob , which is ill - defined . The mediastinal contours are within normal limits . The visualized upper abdomen is unremarkable . There is generalized loss of height of several thoracic vertebral bodies .
    OUTPUT:
    
Low lung volumes . Right basilar opacity is likely atelectasis . Asymmetry of right hilar structures may be due to accentuation of vessels by rotation and low volumes , but a mass can not be excluded radiographically . Followup PA and lateral chest radiographs are recommended with improved positioning and deeper inspiratory level when the patient 's condition permits in order to re-evaluate the right hilus .