Most of the time, the tortilla chips are a pie shaped triangle. This is understandable, because a tortilla is round. The pieces are thrown into hot oil and fried. A few minutes later, you have tortilla 'chips'.
BCIR is not for people who have or need a colostomy, people with [active] Crohn's disease, mesenteric desmoids, obesity, advanced age, or poor motivation. When Crohn's disease only affects the colon, it may, in select cases, be appropriate to perform a BCIR as an alternative to a conventional ileostomy. If the small intestine is affected, however, it is not safe to have the BCIR (because the internal pouch is created out of the small intestine, which must be healthy).
A total colectomy with some or all of the rectum left in place may be done in certain cases of either ulcerative colitis or Crohn's disease. A total colectomy will also require the creation of an ileostomy (with a stoma, where a bag is worn on the outside of the body to collect stool).