Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest dated ___ at 17 :00 are submitted .
    OUTPUT:
    
Lung volumes are slightly diminished with streaky linear opacities the left base likely reflecting atelectasis . A 6 mm nodular opacity overlying the left seventh anterior rib is felt to correspond to a nipple shadow . No pulmonary edema , pleural effusions or pneumothorax . Overall cardiac and mediastinal contours are stable . Mild degenerative changes in the thoracic spine .