A unique 3D endoanal ultrasound feature of perianal Crohn’s fistula: the ‘Crohn ultrasound fistula sign’

Aim  Using a high‐resolution 3D endoanal ultrasound, we have observed that some perianal fistulas show a hypoechogenic fistula tract surrounded by a well‐defined hyperechogenic area with a thin hypoechogenic edge in patients with Crohn’s disease [‘Crohn’s Ultrasound Fistula Sign’ (CUFS)], unlike conventional fistula tracks. The study aimed to determine the prevalence of CUFS in a consecutive series of patients with anal fistula.

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