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Two Cases of Low Intersphincteric Anal Fistulas with Intrafistulous Calculi

Yoshiyuki Suzuki¹, Kosuke Okamoto¹, Joji Kuromizu¹

¹Department of Proctology, Matsushima Hospital, Yokohama, Japan.

Journal of the Anus, Rectum and Colon

|November 3, 2025

Abstract:

Anal fistulas with intrafistulous calculi are extremely rare. Enterolithiasis generally occurs due to the precipitation, aggregation, and calcification of non-digestible materials; however, its occurrence within anal fistulas remains poorly understood. Here, we report two cases of low intersphincteric anal fistulas with intrafistulous calculi, diagnosed via endoanal ultrasonography and treated surgically. We discuss the possible pathophysiological mechanisms, imaging characteristics, and clinical significance of these calculi.

Keywords:

anal fistula endoanal ultrasonography enterolithiasis fistulous calculi surgery

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