[Perforations in Crohn's ileitis and their consequences in the natural history of the disease]
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Updated: Aug 17, 2026
Murine Ileocolic Bowel Resection with Primary Anastomosis
Published on: October 29, 2014
1Scuola di Specializzazione in Chirurgia Generale, Università degli Studi di Firenze.
Abstract:
Not all Crohn's ileitis perforations occur in the peritoneal cavity; a proportion of them, which may be theoretically calculated as about 8%, occurs between the two leaves of the mesentery. These mesenteric perforations (which perhaps may be called more properly "penetrations") produce their pathological consequences in three consecutive anatomical compartments: 1) between the two leaves of the mesentery, causing mesenteric abscesses which are very dangerous, especially because of their embolisation into portal vessels (pylephlebitis, hepatic abscesses); 2) in the lower right quadrant of the retroperitoneum, causing what we call "Mesenteric Insertion Retroperitoneal Syndrome" (MIRS), consisting of a collection producing genito-femoral neuralgia, psoitis, obstructive uropathy and iliofemoral thrombophlebitis; 3) out from the pelvis, causing collections which in their spreading recall the cold abscesses of Pott's disease and which, diffusing along muscles and nerves, reach Scarpa's triangle, or the buttock and popliteal space.
Insights
About 8% of Crohn's ileitis perforations occur within the mesentery, not the peritoneal cavity. These mesenteric perforations can lead to dangerous abscesses and a unique retroperitoneal syndrome (MIRS).
Area of Science:
- Gastroenterology
- Surgical Anatomy
- Pathology
Context:
- Crohn's ileitis perforations typically occur within the peritoneal cavity.
- A significant subset of these perforations, approximately 8%, occurs within the mesentery.
- Understanding these mesenteric events is crucial for comprehensive patient management.
Purpose:
- To describe the anatomical pathways and pathological consequences of mesenteric perforations in Crohn's ileitis.
- To highlight the distinct clinical syndromes arising from these specific perforations.
- To differentiate mesenteric perforations from typical peritoneal perforations.
Summary:
- Mesenteric perforations in Crohn's ileitis present unique challenges, often misdiagnosed or underestimated.
- These perforations lead to three distinct pathological compartments: mesenteric abscesses with potential pylephlebitis, Mesenteric Insertion Retroperitoneal Syndrome (MIRS), and pelvic/lower extremity abscesses.
- MIRS is characterized by genito-femoral neuralgia, psoitis, obstructive uropathy, and iliofemoral thrombophlebitis.
Impact:
- Improves understanding of rare Crohn's ileitis complications.
- Aids in earlier diagnosis and targeted treatment of mesenteric perforations.
- Potential to reduce morbidity and mortality associated with mesenteric and retroperitoneal complications.
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