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a Contrast-enhanced CT scan of a man who had suffered a traffic accident. An infiltrative mediastinal haematoma is identified with subtle areas of high CT-attenuation values (arrow). Bilateral pleural effusion (*) and a sternum fracture (open arrow) are also observed. b Iatrogenic mediastinal haematoma (arrow) in a 64-year-old man secondary to bronchoscopy with transtracheal biopsy. Note the high attenuation value of the lesion compared with muscular tissue
