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Type 1 Dolichocolon as a Potential Anatomic Co-morbidity in Children with Perianal Crohn's Disease
Richard Kellermayer1,2,3, Réka G Szigeti4, Marla Sammer5
1Division of Pediatric Gastroenterology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA. kellerma@bcm.edu.
Insights
Type 1 dolichocolon (T1-DC), a form of colonic redundancy, is more common in children with perianal Crohn's disease (PCD). This finding may help identify patients at risk for severe disease and guide treatment strategies.
Area of Science:
- Pediatric Gastroenterology
- Pediatric Surgery
- Inflammatory Bowel Disease Research
Background:
- Perianal Crohn's disease (PCD) is a severe form of pediatric inflammatory bowel disease (IBD).
- Constipation and colonic redundancy, specifically type 1 dolichocolon (T1-DC), may worsen perianal pathology by increasing distal pressure.
- The study investigates the prevalence of T1-DC in children with PCD compared to other groups.
Purpose of the Study:
- To test the hypothesis that T1-DC is more prevalent in children with PCD.
- To compare T1-DC frequency in PCD patients versus those with uncomplicated ileocolonic Crohn's disease (CD) and non-IBD controls.
- To explore the association between T1-DC and PCD, even in the absence of constipation history.
Main Methods:
- A retrospective review of electronic medical records was conducted.
- Dolichocolon (DC) types (T1-DC and T2-DC) were identified using radiographic criteria.
- Constipation history was extracted from medical records under IRB approval.
Main Results:
- Dolichocolon was significantly more prevalent in PCD patients compared to ileocolonic CD and control groups (p < 0.001).
- Type 1 dolichocolon (T1-DC) was the primary contributor to this increased prevalence.
- The association between T1-DC and PCD remained significant (p < 0.03) even in patients without a history of constipation.
Conclusions:
- Rectosigmoid redundancy, specifically T1-DC, may be an underrecognized comorbidity in pediatric PCD.
- T1-DC could contribute to increased distal pressure and susceptibility to perianal complications.
- Identifying T1-DC may inform surgical decisions and postoperative management for PCD, potentially reducing recurrence risk.
Background:
Perianal Crohn's disease (PCD) represents one of the most severe and refractory forms of pediatric inflammatory bowel disease (IBD). Constipation and colonic redundancy, particularly type 1 dolichocolon (T1-DC), may increase distal rectosigmoid pressure, and exacerbate perianal pathology. We hypothesized that T1-DC is more common in children with PCD than in those with uncomplicated ileocolonic Crohn's disease (CD) or non-IBD controls.
Methods:
Retrospective electronic medical record search was performed. DC type was determined radiographically using established criteria, focusing on T1- and T2-DC. Constipation history was abstracted from medical records under IRB-approved protocols.
Results:
Twenty consecutive children with PCD [penetrating (B3p) or inflammatory (B1p)] were compared to 20 children with non-complicated ileocolonic CD (L3/B1) and 30 non-IBD trauma controls. DC was significantly more prevalent in PCD than in ileocolonic CD or controls (p < 0.001), primarily due to T1-DC. The associations persisted (p < 0.03) in PCD patients without a history of constipation.
Conclusions:
Rectosigmoid redundancy (T1-DC) may represent an underrecognized anatomic co-morbidity in children with PCD, contributing to increased distal pressure and susceptibility to perianal complications. Identification of T1-DC could inform surgical decision-making and postoperative management. Targeted approaches-such as segmental resection during stoma reversal, structured bowel regimens, physical activity, and pelvic-floor biofeedback-may help reduce recurrence risk. Prospective studies are needed to define the mechanistic role of colonic redundancy in the pathogenesis of PCD.
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