MeSH annotation : diseases: coord IM with ILEAL DISEASES (IM); neopl: coord IM with ILEAL NEOPLASMS
(IM); ileocecal intussusception or invagination: index under ILEOCECAL VALVE (IM)
INTUSSUSCEPTION (IM) ILEAL DISEASES (IM) but not also CECAL DISEASES;
Wikipedia link : https://en.wikipedia.org/wiki/Ileocecal valve;