A case of acute gastric volvulus associated with eventration of the diaphragm in a previously well 6 year old child is reported. The child presented with acute abdominal pain, abdominal distension and vomiting. At operation, mesentero-axial type gastric volvulus was found, associated with laxity of the gastro-splenic, gastrohepatic and gastrocolic ligaments and eventration of the left hemidiaphragm. Rapid recovery followed surgery that included release of distension and fixation of the stomach to the anterior abdominal wall. There has been no evidence of recurrence on a 2 year follow-up.