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Intestinal muscularis propria increases in thickness with corrected gestational age and is focally attenuated in

Sarah Lai1, Weiming Yu2, Laurie Wallace1

  • 1Division of Pediatic Surgery, Alberta Children's Hospital, University of Calgary, Calgary, Alberta, Canada.

Journal of Pediatric Surgery
|January 21, 2014
PubMed

Insights

Isolated intestinal perforation (IIP) in infants involves thinner intestinal muscles. This study shows muscle thickness increases with corrected gestational age, suggesting primary repair is suitable for IIP.

Area of Science:

  • Neonatal surgery
  • Pediatric pathology
  • Gastrointestinal development

Background:

  • Intestinal perforations are common in premature infants, often misdiagnosed as necrotizing enterocolitis.
  • Isolated intestinal perforation (IIP) is linked to muscularis propria absence, but its developmental origins are unclear.

Purpose of the Study:

  • To investigate the relationship between corrected gestational age (CGA) and intestinal muscle development in controls and infants with IIP.
  • To understand the developmental trajectory of intestinal muscle layers in relation to IIP.

Main Methods:

  • Histological examination of intestinal specimens from stillbirths and infants (8-48 weeks' CGA) between 2005-2012.
  • Analysis of muscularis mucosa, circular, and longitudinal muscle thickness in 12 IIP patients and controls.
  • Statistical comparison using linear regression and ANOVA.

Main Results:

  • A linear correlation was observed between CGA and the thickness of circular and longitudinal muscles in control and normal intestinal segments.
  • Intestinal segments affected by IIP exhibited significantly thinner circular and longitudinal muscles compared to adjacent normal segments and controls (p<0.05).

Conclusions:

  • Intestinal muscularis propria thickness progressively increases with corrected gestational age.
  • Focal attenuation of muscle layers in IIP suggests a localized developmental issue, supporting primary surgical repair.
Abstract

Keywords:
MuscularisNeonateSpontaneous isolated intestinal perforation

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