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

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 8 — a Color flow imaging showing the Doppler appearance of a hypervascular inflammed anal region. b Endoanal ultrasound (EAUS) with a 360-degree radial transducer showing the muscular layers of the anal canal (red arrows), as well as the soft appearance of an inflammed anal sphincter region (courtesy of Christoph F. Dietrich).