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. 2017 Sep 12;9:643–656. doi: 10.2147/IJWH.S103789

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© 2017 Salsi et al. This work is published and licensed by Dove Medical Press Limited

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Three-dimensional transperineal tomographic ultrasound images of anal sphincter.

Note: Normal external (anechogenic, indicated by the arrows) and internal (hyperechogenic, indicated by the arrow heads) anal sphincters are shown.