Signs and tests:
Signs of mediastinitis include chest wall tenderness, wound drainage, and an unstable chest wall in patients who have had recent surgery. A chest x-ray may show a widened mediastinum, caused by the collection of white blood cells within the chest.
A chest CT scan may show a more detailed view of the mediastinitis. Your health care provider may insert a needle into the area of inflammation and withdraw a sample to send for gram stain and culture to identify the source of any infection.