Does endoanal ultrasound detect secondary tracts more accurately than EUA alone in patients with complex perianal CD

What is known

- Combining modalities improves accuracy: in a 32-patient series, EAUS, MRI, and EUA each had accuracy ≥85%, and pairing any two reached 100% ¹.

What is unknown / caveats

- The retrieved evidence does not directly compare endoanal ultrasound (EAUS) against examination under anaesthesia (EUA) alone for detecting secondary tracts - No head-to-head secondary-tract detection rate is reported.

## References

1. Molteni RA, Bonin EA, Baldin Júnior A, Barreto RAY, Brenner AS, Lopes TL, Volpato APDJ, Sartor MC. Usefulness of endoscopic ultrasound for perianal fistula in Crohn's disease. Rev Col Bras Cir. 2019;45(6):e1840. PMID: 30624518.

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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._