<prompt> Borchardts triad of acute epigastric pain, violent retching and inability to pass a nsogastric tube is seen in patients withAcute gastric volvulusAchalasia cardiaJejunogastric intussusceptionHitus hernia  <response>: A volvulus is a twisting or axial rotation of a portion of bowel about its mesentery.When complete it forms a closed loop of obstruction with resultant ischaemia secondary to vascular occlusion. 