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Type 1 Dolichocolon as a Potential Anatomic Co-Morbidity in Pediatric Perianal Crohn's Disease
Richard Kellermayer1,2, Réka G Szigeti3, Marla Sammer4
1Division of Pediatric Gastroenterology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, USA.
Insights
Type 1 dolichocolon (T1-DC), a form of colonic redundancy, is more common in pediatric perianal Crohn's disease (PCD) patients than in other groups. This finding may help guide treatment for severe pediatric inflammatory bowel disease (IBD).
Area of Science:
- Pediatric Gastroenterology
- Inflammatory Bowel Disease Research
- Surgical Gastroenterology
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 rectosigmoid pressure.
- This study investigated the prevalence of T1-DC in pediatric PCD compared to other groups.
Purpose of the Study:
- To determine if type 1 dolichocolon (T1-DC) is more prevalent in children with perianal Crohn's disease (PCD).
- To compare the incidence of T1-DC in pediatric PCD patients versus those with uncomplicated ileocolonic Crohn's disease (CD) and non-IBD controls.
Main Methods:
- Retrospective analysis of 20 pediatric PCD cases (penetrating or inflammatory) and 20 ileocolonic CD patients.
- Comparison with 30 non-IBD trauma controls.
- Radiographic determination of dolichocolon (DC) type (T1-DC and T2-DC) and abstraction of constipation history.
Main Results:
- Dolichocolon (DC) was significantly more prevalent in the PCD group compared to ileocolonic CD and controls (p < 0.001).
- Type 1 dolichocolon (T1-DC) was the primary driver of this increased prevalence.
- The association between T1-DC and PCD remained significant even in patients without a history of constipation (p < 0.03).
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 in pediatric PCD.
- Identifying T1-DC may inform surgical decisions and postoperative management, potentially reducing recurrence risk through targeted interventions.
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:
We retrospectively analyzed 20 consecutive pediatric PCD cases (penetrating [B3p] or inflammatory [B1p]) and compared them with 20 patients with non-complicated ileocolonic CD (L3/B1) and 30 non-IBD trauma controls. 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:
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 pediatric 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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