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. 2021 Sep 1;406(7):2497–2505. doi: 10.1007/s00423-021-02307-5

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© The Author(s) 2021

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Fig. 1 — Endoanal ultrasound image showing a coronal section of a right lateral transphincteric fistula and arrows indicating total length and involved sphincter of both the internal and external anal sphincters. A internal anal sphincter, B external anal sphincter, C puborectalis muscle, D fistula tract