When a mare exhibits signs of colic during the last trimester of gestation, uterine torsion should alwaysbe part of the differential diagnosis. Uterine torsion is an infrequently occurring but serious complication inpregnant mares. In this article a review is given of the appearance, causes, symptoms, diagnostic examinations,treatment options and prognosis for the mare, as well as for her foal. At the end, three unusual cases aredescribed.