[A dyspnoeic woman with an abnormal chest image].

A 19-year-old woman presented with a productive cough, fever and chest pain. Clinical and chest X-ray findings prompted us to do a CT-scan, which revealed a mediastinal mass extending in the left thoracic cavity, suggestive of a teratoma with an obstructive pneumonia. The patient was successfully treated with intravenous antibiotics and surgical removal of the tumour.