Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right internal jugular central venous catheter with tip located in the proximal right atrium . No pneumothorax . Lung volumes are low which causes crowding of bronchovascular structures and persistent widening of the superior mediastinal contour . Heart size is exaggerated as result of low lung volumes , appearing mild to moderately enlarged . There is no overt pulmonary edema . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Right internal jugular central venous catheter tip in the proximal right atrium . No pneumothorax . Low lung volumes with bibasilar atelectasis .