Enteropathic histopathological features may be associated with Shwachman-Diamond syndrome

Area of Science:

• Pediatric Gastroenterology
• Gastrointestinal Pathology
• Rare Genetic Disorders

Background:

• Shwachman-Diamond syndrome (SDS) is a rare inherited disorder characterized by pancreatic exocrine insufficiency, bone marrow dysfunction, and skeletal abnormalities.
• Gastrointestinal manifestations in SDS are often attributed to pancreatic exocrine failure, but the role of direct intestinal pathology is less understood.

Purpose of the Study:

• To investigate the histological features of gastrointestinal mucosal biopsies in children diagnosed with Shwachman-Diamond syndrome.
• To identify specific enteropathic changes and inflammatory patterns in the duodenal mucosa of SDS patients.

Main Methods:

• Retrospective review of gastrointestinal biopsies from 15 children with SDS at a specialist center.
• Morphological analysis of duodenal biopsies, including crypt:villous ratio, crypt hyperplasia, and inflammatory infiltrates.
• Immunohistochemical staining (CD4, CD20, HLA-DR) to characterize inflammatory cell populations.

Main Results:

• Over 50% of SDS patients (8/15) displayed enteropathic histological features, ranging from villous blunting to partial villous atrophy and duodenitis.
• Significant duodenal inflammation was observed in 73% of cases (11/15), with increased plasma cells, macrophages, and eosinophils in the lamina propria.
• While 47% (7/15) had normal duodenal villous architecture, inflammatory changes were still prevalent.

Conclusions:

• Symptomatic children with Shwachman-Diamond syndrome frequently present with duodenal inflammatory enteropathic features.
• These findings suggest an enteropathic component may contribute to symptoms in SDS, independent of or in addition to pancreatic exocrine dysfunction.
• The identified enteropathic features may represent a potential therapeutic target in managing SDS patients.