What is the diagnostic yield of capsule endoscopy for detecting small bowel CD lesions in adults
What is known
- A meta-analysis is repeatedly cited showing capsule endoscopy has a significantly higher diagnostic yield than other modalities in suspected and established small-bowel Crohn's disease. 1–3 - Capsule endoscopy has high sensitivity and a high negative predictive value for small-bowel mucosal lesions, including small, flat abnormalities missed by small bowel follow-through. 4 Specificity is its recognised weakness: small-bowel mucosal breaks are non-specific and occur in a substantial minority of healthy volunteers and NSAID users, so threshold criteria (for example three or more ulcers) and confirmatory testing are needed. - Its mucosal diagnostic yield for small bowel Crohn's disease is described as at least comparable to MR enterography or CT enterography. 3 Capsule cannot assess transmural, stricturing or penetrating disease, so it complements rather than replaces cross-sectional enterography, which guidelines position first line.
What is unknown / caveats
- Excerpts are mostly reference lists and qualitative statements; no pooled yield percentages are quoted in the provided text - Much of the retrieval concerns IBDU/ulcerative colitis or pediatric populations rather than adult diagnostic-yield figures - A precise adult diagnostic-yield figure cannot be given from these excerpts because no numeric yield is stated.
## References
1. Luján-Sanchis M, Sanchis-Artero L, Larrey-Ruiz L, Peño-Muñoz L, Núñez-Martínez P, Castillo-López G, González-González L, Clemente CB, Albert Antequera C, Durá-Ayet A, Sempere-Garcia-Argüelles J. Current role of capsule endoscopy in Crohn's disease. World J Gastrointest Endosc. 2016;8(17):572-83. PMID: 27668067.
2. Gralnek IM, Cohen SA, Ephrath H, Napier A, Gobin T, Sherrod O, Lewis J. Small bowel capsule endoscopy impacts diagnosis and management of pediatric inflammatory bowel disease: a prospective study. Dig Dis Sci. 2012;57(2):465-71. PMID: 21901253.
3. Hudesman D, Mazurek J, Swaminath A. Capsule endoscopy in Crohn's disease: are we seeing any better?. World J Gastroenterol. 2014;20(36):13044-51. PMID: 25278698.
4. Mehdizadeh S, Chen G, Enayati PJ, Cheng DW, Han NJ, Shaye OA, Ippoliti A, Vasiliauskas EA, Lo SK, Papadakis KA. Diagnostic yield of capsule endoscopy in ulcerative colitis and inflammatory bowel disease of unclassified type (IBDU). Endoscopy. 2008;40(1):30-5. PMID: 18058654.
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⚠ Required context not in this corpus (severe). Capsule RETENTION occurs in ~13% of patients with ESTABLISHED Crohn's disease (vs ~1.6% with suspected CD), Cheifetz 2006, PMID 16848804, so cross-sectional imaging or a patency capsule should precede capsule endoscopy where stricturing disease is known/suspected.
_Why this matters:_ Recommending capsule endoscopy in known Crohn's without naming retention risk can send a patient with an occult stricture to an avoidable emergency laparotomy.
_Added by the landmark interlock. This corpus is surgical in scope and cannot admit the source paper (PMID 16848804). Not generated by the RAG._
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_Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct._
Reviewer notes