Differential Diagnosis of Villous Atrophy

Primary Diagnostic Consideration: Celiac Disease

The European Society of Gastrointestinal Endoscopy recommends that celiac disease be considered as the primary cause of villous atrophy, increased intraepithelial lymphocytes, and crypt hyperplasia 1, 2
Celiac disease characteristically presents with villous atrophy, increased intraepithelial lymphocytes (≥25 IELs per 100 enterocytes), and crypt hyperplasia, according to the European Society of Gastroenterology 3, 4

The American Gastroenterological Association recommends measuring IgA tissue transglutaminase antibodies (tTG-IgA) with total IgA level to rule out IgA deficiency, which occurs in 1-3% of celiac patients 5
If IgA deficient, the American Gastroenterological Association recommends obtaining IgG-based tests (IgG-DGP or IgG-tTG), which maintain excellent sensitivity and specificity 5

The European Society of Gastrointestinal Endoscopy recommends excluding medication-induced enteropathy, particularly olmesartan enteropathy, which causes severe villous atrophy that mimics celiac disease but responds rapidly to drug cessation 1, 2
Giardiasis is a critical infectious mimic that produces villous atrophy with increased IELs and must be excluded in seronegative patients, according to the Centers for Disease Control and Prevention 1, 2, 5

The American Gastroenterological Association recommends obtaining multiple biopsies (ideally 6 specimens) from the second part of the duodenum or beyond, as mucosal changes can be patchy 5
The American Gastroenterological Association recommends performing celiac serology BEFORE initiating gluten-free diet (tTG-IgA, total IgA, consider EMA) 5

The American Gastroenterological Association recommends initiating strict lifelong gluten-free diet immediately after biopsy confirmation with referral to registered dietitian, if celiac disease is confirmed 5
The European Society of Gastroenterology recommends considering trial of gluten-free diet for 6 months in patients with compatible histology and HLA-DQ2/DQ8 positivity, as seronegative celiac disease exists 5, 6