Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited due to patient body habitus . Lung volumes are low and exaggerate the pulmonary vascular markings . There is mild right basilar and left retrocardiac atelectasis ; otherwise , the lungs are clear and without a focal consolidation , effusion , or pneumothorax . A tracheostomy button is noted in the upper trachea . Cardiac silhouette is exaggerated .
    OUTPUT:
    
Limited study due to patient body habitus and low lung volumes demonstrates mild bibasilar atelectasis .