Related Experiment Video
Updated: Aug 11, 2026

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
Published on: April 17, 2019
Reflex anal dilatation associated with severe chronic constipation in children
1Department of Paediatrics, United Medical and Dental School of Guy's Hospital, London.
Severe constipation in children can cause anal sphincter relaxation, mimicking signs of sexual abuse. This finding highlights the importance of considering constipation in differential diagnoses to prevent misdiagnosis in pediatric cases.
Area of Science:
- Pediatric Gastroenterology
- Child Abuse Diagnosis
- Clinical Examination Findings
Background:
- Chronic constipation is a common pediatric issue.
- Certain physical signs can be misinterpreted in clinical evaluations.
- Accurate diagnosis is crucial to avoid unnecessary interventions and distress.
Purpose of the Study:
- To investigate the association between severe constipation and anal sphincter appearance in children.
- To determine if constipation can present with signs suggestive of anal penetration.
- To support or refute the hypothesis that constipation can lead to erroneous sexual abuse diagnoses.
Main Methods:
- Observational study involving children with severe chronic constipation.
- Systematic examination of the anal appearance at presentation.
- Correlation of sphincter findings with clinical data, including fecal loading.
Main Results:
- A visibly relaxed anal sphincter, indicating reflex anal dilatation, was observed in 20 out of 129 children.
- The primary distinguishing feature in this subgroup was a greater degree of fecal loading.
- No other significant differentiating characteristics were noted.
Conclusions:
- Severe constipation in children can manifest with anal sphincter relaxation.
- These findings can be mistaken for signs of anal penetration, leading to potential misdiagnosis of sexual abuse.
- Clinical awareness of constipation-induced changes is essential for accurate pediatric assessments.
Related Concept Videos
Drugs for Treatment of Constipation-Predominant IBS
Feces Formation and Defecation
The mass peristalsis then pushes the feces into the rectum, which stretches the rectal walls to activate...
The Micturition Reflex
The process begins with bladder filling, where the bladder wall stretches as urine accumulates. This stretching activates the urine storage reflex, mediated by the sacral spinal segments and the pontine storage center. Efferent sympathetic impulses stimulate the detrusor muscle to relax and the internal urethral sphincter to contract, facilitating urine...
Assessment of the Rectum and Anus
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Inflammatory Bowel Disease V: Surgical Management
Here are some common surgical interventions for IBD:
Intestinal Obstruction II: Pathophysiology

