Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous . Pulmonary vasculature is normal . There is minimal patchy left lower lobe patchy opacity likely reflective of atelectasis , however contusion or aspiration is not excluded . No focal consolidation , pleural effusion or pneumothorax is present . There mild degenerative changes noted in the thoracic spine . Lucency through the posterior left eighth rib is concerning for a nondisplaced fracture .
    OUTPUT:
    
1 . Left posterior eighth rib fracture . 2 . Minimal left lower lobe patchy opacity , potentially atelectasis however aspiration or contusion can not be excluded .