Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is post-thyroidectomy . The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . A cortical defect at the upper aspect of the sternum may represent a non-displaced fracture . No overlying soft tissue swelling is seen . No rib fractures are detected , although this technique is not optimized for evaluation of osseous trauma .
    OUTPUT:
    
Likely upper sternal non-displaced fracture . No pneumothorax .