Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is trauma board artifact overlying both lungs . Mild prominence of the cardiac silhouette is likely accentuated by supine positioning and AP technique . The cardiomediastinal silhouette is otherwise within normal limits . Minimal density at both lung apices is noted , but the appearance is not typical for apical capping . Lungs are relatively well expanded . No CHF , focal infiltrate or consolidation , or pleural effusion is identified . No supine film evidence of pneumothorax is detected . Limited assessment of the upper abdomen is grossly unremarkable . Visualized osseous structures are notable for mild degenerative changes within the thoracolumbar spine , with osteophyte formation and subchondral sclerosis . There is a possible nondisplaced posterior ___ left rib fracture .
    OUTPUT:
    
1 . Possible non displaced posterior left 11th rib fracture . Clinical correlation for focal tenderness in this location is recommended . 2 . Otherwise no acute pulmonary process identified . 3 . Mild prominence of the cardiomediastinal silhouette is likely accentuated by technique . Attention to this on followup radiographs could help for further assessment .