A unique 3D endoanal ultrasound feature of perianal Crohn's fistula:the "Crohn ultrasound fistula sign" (CUFS).
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 outside characterized fistulas in patients with Crohn's disease ("Crohn's Ultrasound Fistula Sign" (CUFS)), unlike conventional fistula tracks.. The study aimed to determine the prevalenc