Duodenal Bulb Histology in Paediatric Celiac Disease: A Case-Control Study.

Background: Controversy exists about optimal methods for duodenal biopsy in diagnosis of celiac disease (CD), in terms of both number of samples and anatomic location. The reliability of duodenal bulb biopsy has been questioned given that normal bulb architecture may mimic disease. However, multiple studies have reported patients with CD have histopathological lesions limited to proximal changes in the duodenal bulb alone.

Methods: We retrospectively compared duodenal and duodenal bulb histology in a population of paediatric patients with CD and compared with a population of nonceliac controls at Stollery Children's Hospital, 2010 to 2012.

Results: Fifty-seven paediatric patients diagnosed with CD and 16 nonceliac controls were included in the study. Fifty-three celiac patients (93.0%) had histopathology consistent with CD (modified Marsh score of 3A, 3B or 3C) in the duodenal bulb. The modified Marsh classification differed significantly between duodenum and duodenal bulb in nine celiac patients (15.8%). Of these, five (8.8%) had Marsh 3 in the bulb and Marsh 0 in the distal duodenum. Among controls, no patients had villous atrophy in either the distal duodenum or duodenal bulb, and all patients had a modified Marsh score of 0 at both sites.

Conclusions: The results of this study reinforce that duodenal bulb samples are critically important for diagnosing CD in paediatric patients. We suggest that duodenal bulb samples be submitted in separate containers from distal duodenal samples to facilitate accurate interpretation. In contrast to prior reports, we found villous blunting and intraepithelial lymphocytosis are actually uncommon findings in paediatric patients with nonceliac gastrointestinal disorders.