Complications from constipation may include hemorrhoids, anal fissure or fecal impaction. Individuals who have had one fecal impaction are at high risk of future impactions. It can possibly form secondary to fecal impaction. Other rare syndromes, including Ogilvie's syndrome, chronic constipation and impaction may cause a pseudo obstruction. Atresia coli and atresia ani can also present as meconium impaction. Ileal impaction can be caused by obstruction of ingesta. Limited data also support its use for the treatment of fecal impaction. Even a slightly dehydrated horse is at higher risk of developing impaction colic. The rectum should be cleared of stool impaction, using anaesthetic lubricating jelly. The bill morphology facilitates feeding of diatoms through inertial impaction. This commonly results in the impaction of the incisors during the mixed dentition stage. Symptoms are swallowing difficulty, food impaction, vomiting, and heartburn. This allows the impaction to be treated without actually cutting into the ileum. These tears are a component of ulnar impaction syndrome. The restoration can fail due to fracture, food impaction, and inflammation.