The narrowing can force bowel contents into fissures and ulcers at the site, causing additional damage and narrowing. The surgery restores free flow through the bowel without the need for removing bowel segments (i.e., without bowel resection).
The narrowing in diameter can force bowel contents into fissures and ulcers, leading to additional damage and further narrowing. The surgery ensures normal bowel function by not requiring the removal of any bowel sections (i.e., without bowel resection).