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Related Experiment Videos

Normal female anal sphincter: difficulties in interpretation explained.

R C Bollard1, A Gardiner, S Lindow

  • 1Royal Lancaster Infirmary, Lancaster, United Kingdom.

Diseases of the Colon and Rectum
|February 20, 2002
PubMed
Summary
This summary is machine-generated.

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The female anal sphincter naturally has a variable anterior defect, unlike the complete ring in males. This anatomical variation impacts ultrasound interpretation and may explain overreported obstetric injuries.

Area of Science:

  • Anatomy
  • Physiology
  • Medical Imaging

Background:

  • Understanding anal sphincter anatomy is crucial for diagnosing and managing anorectal conditions.
  • Previous studies may have misinterpreted normal anatomical variations as sphincter defects.

Purpose of the Study:

  • To quantify the characteristics and frequency of variations in female anal sphincter anatomy.
  • To compare female anal sphincter anatomy with that of males.

Main Methods:

  • Endoanal ultrasound and manometry were used to assess anal sphincter anatomy in nulliparous women and healthy volunteers.
  • Sphincter length was determined by puborectalis sling position; defects were measured in degrees.
  • Three-dimensional imaging software created cylindric longitudinal scans.

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Main Results:

  • No significant difference in overall or internal anal sphincter length between genders.
  • All males had a complete external anal sphincter ring.
  • A natural anterior defect in the external anal sphincter was observed in 75% of nulliparous women and 100% of female volunteers.

Conclusions:

  • The female anal sphincter exhibits a natural, variable anterior defect.
  • This anatomical finding complicates endoanal ultrasound interpretation.
  • The defect may account for previous overestimations of obstetric sphincter injuries.