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Creation of the isolated bowel segment (IBS) by omentoenteropexy in rats and dogs consists of a two-step procedure: initial omentoenteropexy to the antimesenteric border of a jejunal segment, and division of its mesentery 6 weeks later. Viability of this IBS is maintained by the angiogenic process, which occurs at the level of the myoenteropexy. Histological studies were performed by light microscopy on the bowel wall structures of the IBS before and after the mesenteric division, as well as after a lengthening procedure performed on the IBS in one dog. The authors conclude that (1) in rats and dogs the intestinal wall structures of all IBS variants created by omentoenteropexy appear close to normal, and (2) neovascularization can be clearly detected at the level of the omentoenteropexy.

An isolated bowel segment (IBS) was created in dogs by omentoenteropexy, using staged procedures. (1) Omentoenteropexy was performed at the antimesenteric border of a 15-cm jejunal segment, which was exteriorized at both ends (IBSB). (2) After 6 weeks, once dual vascularization to the IBS had been established, its mesentery was divided (IBSA) or longitudinally split, thus achieving its elongation (IBSE). A control dog underwent a Thiry-Vella (T-V) loop procedure of an identical jejunal segment. Viability of the IBSB and IBSA was previously proven by the authors, through angiographic studies. In the present study, the absorption capability of IBS variants was assessed using in situ luminal perfusion, with a bicarbonate buffer containing glucose and labeled glycine. Jejunal transport rates of these solutes were calculated from the differences in their concentrations in the perfusion solution and in the effluent. Comparisons were made among the IBS variants and between them and the T-V loop. No significant difference in the absorption capability of glucose and glycine was noted between the various IBS variants. There was a marked reduction of glucose absorption and a moderate reduction of glycine absorption in all IBS variants. when compared with the fresh T-V loop, most probably because of disuse atrophy of the mucosa. In conclusion, absorption of glucose and glycine is preserved in the IBS, created by omentoenteropexy, both after its mesenteric division and following the IBS elongating procedure.

An isolated bowel segment (IBS) was created in rats and dogs by a two-stage procedure. Initial coaptation of the bowel segment to the omentum ("omentoenteropexy") is followed by division of its mesentery several weeks later. The viability of the segment is maintained by angiogenesis at the coaptation site. Neoformed blood vessels were shown by angiographic studies, and in a dog the IBS was used for esophageal interposition.

A 3-year-old boy who suffered from severe colicky abdominal pain is presented. Laboratory studies, including ultrasound, upper gastrointestinal films, and 99mTc-scan, were interpreted as normal. On exploration of the abdomen a tubular duplication of the small bowel was found. The duplication had a common mesentery with the normal bowel. By meticulous dissection the duplication was resected without interfering with the blood supply of the normal bowel. The entire duplication was found to be covered by gastric mucosa.