Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , and within normal limits . There is minimal calcification of the aortic knob . The pulmonary vascularity is normal . The lungs are clear though the extreme right costophrenic angle is excluded from the field of view . No large pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .