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Duodenal bulb biopsies detect early or localized pediatric celiac disease missed by distal sampling, but exhibit poorer quality and distinct morphometric features, making IgA deposit assessment essential for accurate detection.
A large prospective pediatric study highlights both the diagnostic value and the limitations of duodenal bulb biopsies in celiac disease, emphasizing the requisition for careful interpretation alongside distal duodenal sampling.
The study enrolled 194 children with positive celiac disease autoantibodies who underwent systematic biopsies from both the duodenal bulb and distal duodenum at diagnosis. Overall, 16 seronegative, non-celiac kids served as controls. Validated morphometric analyses were applied to all samples, including villous height (VH), crypt depth (CrD), and villous height–to–crypt depth ratio (VH:CrD).
Advanced immunohistochemical techniques assessed CD3⁺ and γδ⁺ intraepithelial lymphocyte (IEL) densities and transglutaminase-2–targeted IgA deposits using frozen biopsy specimens. Duodenal bulb samples were frequently compromised, allowing reliable paired morphometric comparisons in only 112 patients. When assessable, bulb biopsies illustrated markedly shorter villi and lower VH:CrD ratios than distal duodenal specimens (168 vs. 239 μm; 0.73 vs. 1.01 respectively).
In contrast, crypt depth and IEL densities were same between the two sites. Importantly, 12 children exhibited celiac-compatible reductions in VH:CrD exclusively in the duodenal bulb, indicating that diagnostic lesions may be confined to this region. Additionally, 8 seropositive children exhibited normal VH:CrD ratios in both bulb and distal biopsies. However, positive γδ⁺ IELs and IgA deposits revealed incipient celiac disease despite preserved mucosal architecture.
IgA deposit analysis proved highly discriminative: 96.4% of children with celiac disease illustrated IgA deposits in both bulb and distal samples, while none of the control children exhibited deposits at either site. These findings confirm that duodenal bulb biopsies can detect early or localized celiac disease not evident in distal duodenal samples alone. However, the higher frequency of inadequate bulb specimens and intrinsic morphometric differences necessitate cautious interpretation.
The consistent presence of transglutaminase-2–targeted IgA deposits across both sites supports their role as a reliable adjunctive diagnostic marker, particularly in early or subtle disease. While duodenal bulb biopsies boost diagnostic yield in pediatric celiac disease, their limitations underscore the importance of multisite sampling and adjunct immunohistochemical assessment to attain accurate and early diagnosis.
Journal of Pediatric Gastroenterology and Nutrition
Bulb biopsies for diagnosing celiac disease in children: A prospective multicenter study using quantitative histomorphometry
Alina Popp et al.
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