Endoanal ultrasound image of intact anal sphincter complex

Endoanal ultrasound image: The thin arrows identify the IAS, which is hypoechoic (dark); the thick arrows identify the mixed echogenicity that is the EAS.

IAS: internal anal sphincter; EAS: external anal sphincter.

Courtesy of Milena M Weinstein, MD, FACOG, FPMRS, and Helai Hesham, MD.

Graphic 116300 Version 2.0

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