Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest provided . Right shoulder replacement is noted as well as partially imaged lower lumbar spinal stabilization hardware . The heart is mildly enlarged . The lung volumes are low . There is bibasilar atelectasis . No overt edema or definite signs of pneumonia . Mediastinal contour is normal . Bony structures appear grossly intact .
    OUTPUT:
    
Study with mild cardiomegaly and bibasilar atelectasis . No overt signs of pneumonia or edema .