HighlightsEventration of diaphragm is an abnormal elevation of an intact diaphragm characterized by a developmental abnormality of the diaphragm musculature.Eventration may be complicated by acute gastric volvulus, chronic gastric volvulus, or chronic recurrent volvulus of the splenic flexure of the colon.Symptomatic gastric volvulus associated with diaphragmatic eventration is a surgical emergency.