Pneumopericardium is a rare complication of blunt or penetrating chest trauma. GCS was 15. Simple penumopericardium can evolve to tension pneumopericardium with circulatory collapse. In this case, urgent drainage of the pericardial sac is mandatory. We present a case study of a 31 years old patient who presented with simple pneumpopericardium as a result of a chest stab wound. Due to his stable condition, we considered that non operative (conservative) management was the best strategy for this patient. This consists in intensive monitoring in intensive care for 24 hours and another 48 hours in critical care unit before being transferred in to a normal chamber, adequate pain control and antibiotic treatment. CT scan in the 5th day revealed no penumopericardium. Patient was discharged on the 7th day.