An acute colic in a 6-month-old Thoroughbred filly is described. The filly was presented with acute colic haracterized by rolling and pawing. Over a period of days she suffered from severe abdominal pain and subsequently died. ost mortem examination revealed the ileocecal intrssusception as a part invagination of the ileum into the cecum. It seems ogical to assume that the invagination occurred at the start of the illness. In addition, it is also noted the presence of Parascaris quorum in the stomach.