The local mobile emergency unit took charge of a patient who suffered from a sudden migratory epigastric pain in the back. The clinical picture led to an initial diagnosis of an aorta dissection. Admitted to Grenoble UH's emergency unit, the radiological examination ruled out a cardiovascular pathology. Emergency surgery, performed only a few hours after the symptoms began, allowed to correctly diagnose a spontaneous rupture of the oesophagus. Fast and specialised medical treatment avoided the risk of an unfavourable development of the Boerhaave's syndrome. It is essential that mobile emergency units personnel are made aware of this rare pathology, even though it remains particularly difficult to diagnose due to its rather non-specific symptoms.