Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single AP supine view of the chest was obtained . The heart is not enlarged . The aorta is calcified and slightly unfolded . The cardiomediastinal contour is otherwise unremarkable . Lungs are well expanded . No chf , focal infiltrate , pleural effusion , or supine film evidence of pneumothorax detected . Probable old healed fracture of the left 7th rib laterally . Probable osteopenia , with tspine degenerative changes . No gross compression fracture identified . No acute rib fracture detected on these lung - technique films .
    OUTPUT:
    
No acute intrathoracic abnormality detected on this single view .