The Authors report a case of right diaphragmatic hernia due to road-traffic accident. They discuss the problems of early diagnosis because it is delayed for multiple associated lesions or a low index of suspicion. The ratio of laceration of the left side to that of the right is twenty to one. The clinical and diagnostic data best able to lead to a rapid preoperative diagnosis are considered. The Authors recommended early operative treatment and the thoracic approach; thoracoabdominal incisions are more suitable whenever abdominal lesions are coexisting. The Authors stress the use of safety belts with three point fastener which have significantly decreases cranial and abdominal lesions, particularly if associated with two rolls up.