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Related Concept Videos

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
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In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...
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Related Experiment Video

Updated: Jan 22, 2026

Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
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Prenatal Dilated Rectum: Do We Need to Worry?

Aimee G Kim1, Deborah R Berman2, Jeannie Kreutzman1

  • 1Department of Surgery, Section of Pediatric Surgery, C.S. Mott Children's Hospital, University of Michigan, Michigan Medicine, Ann Arbor, Michigan; University of Michigan, Michigan Medicine, Fetal Diagnosis and Treatment Center, Ann Arbor, Michigan.

The Journal of Surgical Research
|July 15, 2019
PubMed
Summary
This summary is machine-generated.

Prenatal dilated rectum is usually a normal variant, but can indicate gastrointestinal issues. Further research is needed to define criteria for rectal dilation and guide postnatal care.

Keywords:
Dilated rectumFetalUltrasound

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Area of Science:

  • Fetal Medicine
  • Pediatric Surgery
  • Gastroenterology

Background:

  • Prenatal imaging increasingly detects abnormally dilated bowel.
  • No established criteria exist for a dilated rectum or its association with postnatal pathology.
  • This study investigates the clinical significance of prenatally identified dilated rectum.

Purpose of the Study:

  • To determine the clinical significance of a dilated rectum detected during prenatal ultrasound.
  • To establish criteria for identifying a dilated rectum prenatally.
  • To correlate prenatal rectal dilation with postnatal diagnoses and outcomes.

Main Methods:

  • Retrospective review of prenatal ultrasounds (2000-2017) identifying "dilated bowel".
  • Included cases with a prominent or dilated rectum, excluding ventral wall defects.
  • Collected prenatal measurements, postnatal diagnoses, surgical needs, and outcomes; descriptive statistics were used.

Main Results:

  • 193 cases of prenatal "dilated bowel" were found; 12 (6.2%) showed a dilated rectum.
  • 9 of these (75%) had normal postnatal evaluations without intestinal abnormalities.
  • 3 cases (25%) had significant pathology: meconium plug, jejunal atresia with perforation, or rectal perforation.

Conclusions:

  • Prenatal dilated rectum is typically a normal variant but can signal gastrointestinal abnormalities.
  • No cases of Hirschsprung's disease or anorectal malformations were observed.
  • Defining criteria for rectal dilation aids prenatal counseling and postnatal evaluation.