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We analyze the file of a man in his fifties, brought by the SAMU to the Emergency Department for severe dyspnea that has been worsening for 48-72 hours. The patient is known to have coronary artery disease. The dyspnea is significant, without real chest pain. The O2 saturation is 93%. The BNP is 400. The CRP is 33. The D-dimers are 1800. The main question is the etiology of this dyspnea: acute pulmonary edema VS pulmonary embolism VS (super)infection? The CT scan, performed urgently, will help to sort things out. The discussion focuses on the benefit/risk ratio of the injection of contrast agent. Case presented by Professor Mickaël Ohana, radiologist at the University Hospital in Strasbourg and specialist in cardiovascular and thoracic imaging.