MeSH definition : The distal and narrowest portion of the SMALL INTESTINE, between the JEJUNUM and the
ILEOCECAL VALVE of the LARGE INTESTINE.;
MeSH annotation : do not confuse with ILEUS or ILIUM; /surg: consider ILEOSTOMY; inflammation ILEITIS;
ileocecal intussusception or invagination: index under ILEOCECAL VALVE (IM) INTUSSUSCEPTION
(IM) ILEAL DISEASES (NIM); ileocolic intussusception: index under ILEAL DISEASES
(IM) INTUSSUSCEPTION (IM) but not also COLONIC DISEASES; ileum as smooth muscle
is probably MUSCLE, SMOOTH (IM) ILEUM (NIM); jejuno-ileal bypass or shunt or jejuno-ileostomy
in obesity: index under JEJUNOILEAL BYPASS (note XR ref);
Wikipedia link : https://en.wikipedia.org/wiki/Ileum;