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Anal size in children: the influence of age, constipation, rectal examination and defaecation

A F Connon1, G P Davidson, D J Moore

  • 1Department of Obstetrics and Gynaecology, Flinders Medical Centre, Bedford Park, SA.

The Medical Journal of Australia
|October 1, 1990
PubMed

Insights

Establishing normal anal size in children is crucial for identifying child abuse. This study found normal anteroposterior diameter is under 10.0 mm and transverse diameter is under 2.0 mm in children without anorectal disease.

Area of Science:

  • Pediatric Medicine
  • Forensic Medicine
  • Gastroenterology

Background:

  • Increasing reported cases of child abuse necessitate clear medical guidelines.
  • Accurate assessment of anal size is vital for medical practitioners in suspected child abuse cases.
  • Existing data on normal anal dimensions in children is limited.

Purpose of the Study:

  • To establish normal anteroposterior and transverse anal diameters in children.
  • To provide a standardized examination protocol for assessing anal size in pediatric patients.
  • To aid medical professionals in differentiating normal findings from signs of abuse.

Main Methods:

  • Photographic records of the anus were taken in 54 children aged 3 months to 15 years without anorectal disease.
  • A standardized examination protocol included a 30-second observation period after anal exposure.
  • Measurements of anteroposterior and transverse anal diameters were analyzed.

Main Results:

  • In children without anorectal disease, the anteroposterior diameter was less than 10.0 mm.
  • The transverse diameter was less than or equal to 2.0 mm.
  • Age, sex, digital rectal examination, rectal contents, and time since last defecation did not correlate with anal size.

Conclusions:

  • Normal anal dimensions are established for children aged 3 months to 15 years.
  • A 30-second observation period is recommended for standardized anal examination in a medicolegal context.
  • Medical practitioners require experience with normal anal appearance and size to effectively identify potential abuse.

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