Bulb biopsies for diagnosing celiac disease in children: A prospective multicenter study using quantitative...

Area of Science:

• Pediatric gastroenterology
• Histopathology
• Immunology

Background:

• Duodenal bulb biopsies are recommended for diagnosing celiac disease (CeD).
• Histomorphometry and immunohistochemistry in bulb vs. distal duodenum require further investigation.
• This study addresses the diagnostic utility of bulb sampling in pediatric CeD.

Purpose of the Study:

• Compare histomorphometry and diagnostic yield of duodenal bulb vs. distal duodenum biopsies in pediatric CeD.
• Evaluate advanced immunohistochemistry methods for CeD diagnosis.
• Assess the quality and comparability of bulb specimens.

Main Methods:

• Prospective study of 194 children with CeD autoantibodies undergoing duodenal bulb and distal sampling.
• Morphometric analysis: villous height (VH), crypt depth (CrD), VH:CrD ratio.
• Immunohistochemistry: CD3+, γδ+ intraepithelial lymphocytes (IELs), and transglutaminase-2-targeted IgA deposits.

Main Results:

• Bulb specimens had lower mean VH and VH:CrD compared to distal samples (p<0.001, p=0.027).
• CrD and IEL densities were comparable between bulb and distal sites.
• Twelve patients had CeD-consistent VH:CrD in the bulb only; 96.4% showed IgA deposits in both sites.

Conclusions:

• Duodenal bulb biopsies can reveal diagnostic lesions not present distally, but quality and morphometry differ.
• IgA deposit determination is crucial and valuable at both duodenal sampling sites for CeD diagnosis.
• Careful consideration of specimen quality and site-specific morphometry is needed.