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. 2019 Feb 5;5(1):E34–E51. doi: 10.1055/a-0825-6708

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Fig. 15 — a Anterior half of internal sphincter (IS) defect (red arrows) visualized by radial endoanal ultrasound (EAUS). b Radial EAUS of an anteriorly located fistula (between calipers), with an endoanal image (360°) showing 12 o’clock inter-sphincteric portion of the fistula (red arrow). c Perineal ultrasound (PNUS) view with a high frequency linear transducer depicts well the other portion of the fistula in between calipers (arrowhead), which is out of field of view for endoanal image (courtesy of Ismail Mihmanli).