Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to ___ portable chest graft , the lung volumes are low . Additional , when compared to ___ chest radiograph , the superior portion of the trachea is shifted to the right side . There is is a moderate cardiomegaly without overt pulmonary edema . Atelectatic changes are seen in the bilateral lung bases . No pleural effusion is seen . Pacemaker is visualized on the left chest wall . Pacer wires terminate in the right atrium and right ventricle .
    OUTPUT:
    
1 . Superior portion of trachea appears shifted to the right side when compared to ___ chest radiograph ; this could be secondary to low lung volumes or patient 's rotated position when image was taken . However , can not rule out a comparison mass . Recommend repeat chest x-ray with adequate inspiration for further evaluation .