Tropical sprue vs Celiac disease
How to tell Tropical sprue and Celiac disease apart when a board question makes them look alike.
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Positive celiac serology, especially IgA tissue transglutaminase, is the fastest discriminator toward celiac disease.
Side by side
Chronic malabsorption after extended residence in tropical regions with negative celiac serology and response to antibiotics plus folate favors tropical sprue.
Positive tissue transglutaminase or endomysial antibodies with gluten-triggered symptoms and villous atrophy indicates celiac disease.
Postinfectious small-bowel mucosal injury in tropical environments causes diffuse nutrient malabsorption.
Immune-mediated reaction to gluten causes proximal small-bowel villous atrophy in genetically susceptible patients.
Tropical sprue often shows macrocytosis from folate deficiency, low B12, negative IgA tissue transglutaminase, and diffuse villous blunting on biopsy involving proximal and distal small bowel.
Celiac disease is supported by positive IgA tissue transglutaminase or IgA endomysial antibodies, total IgA assessment to exclude deficiency, and duodenal biopsy showing villous atrophy with crypt hyperplasia.
The trap
The key trap is diagnosing celiac from biopsy alone when serologies are negative without checking travel context or total IgA. The resolving clue is exposure history plus serology pattern and treatment response.
The repair move
Next best step: check total IgA to validate serology interpretation, then use exposure context and biopsy pattern to classify disease. For likely tropical sprue, start tetracycline 250 mg orally four times daily with folic acid 5 mg daily and nutrition repletion; for confirmed celiac disease, initiate strict lifelong gluten-free diet with micronutrient replacement.
Try a free question
CoreA patient with chronic diarrhea and weight loss has villous atrophy on biopsy and strongly positive IgA tissue transglutaminase antibodies. What is the next best step in management?
Show answer and explanation
Answer: A. Begin strict lifelong gluten-free diet with nutrient repletion. Positive celiac serology with compatible histology indicates celiac disease and requires lifelong gluten elimination.
Why the other choices are tempting
- B. Wrong because tetracycline is used for tropical sprue, not serology-positive celiac disease.
- C. Wrong because IV broad-spectrum therapy is not indicated for uncomplicated celiac malabsorption.
- D. Wrong because untreated celiac disease risks persistent malabsorption and complications.
- E. Wrong because colectomy does not treat small-bowel gluten-mediated enteropathy.
Flashcards
Tap a card to flip it.
Which blood test most quickly distinguishes celiac disease from tropical sprue in a malabsorption workup?
IgA tissue transglutaminase, interpreted with total IgA level, is the key serologic discriminator for celiac disease.
What history detail strongly supports tropical sprue over celiac disease?
Prolonged residence in tropical regions before onset of chronic malabsorption supports tropical sprue.
Quick answers
What is the fastest way to tell Tropical sprue from Celiac disease?
Positive celiac serology, especially IgA tissue transglutaminase, is the fastest discriminator toward celiac disease.
What is the key clue for Tropical sprue?
Chronic malabsorption after extended residence in tropical regions with negative celiac serology and response to antibiotics plus folate favors tropical sprue.
What is the key clue for Celiac disease?
Positive tissue transglutaminase or endomysial antibodies with gluten-triggered symptoms and villous atrophy indicates celiac disease.
What is the common trap with Tropical sprue vs Celiac disease?
The key trap is diagnosing celiac from biopsy alone when serologies are negative without checking travel context or total IgA. The resolving clue is exposure history plus serology pattern and treatment response.