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Fig. 2A —Normal anatomy at mid anal canal of internal anal sphincter (IS) and
external anal sphincter (ES). Transverse endoanal sonogram of 65-year-old man
shows normal anatomy at mid anal canal of internal anal sphincter and external
anal sphincter. Top of figure is anterior. Example of one sphincter
measurement performed for our study is shown by area between arrowheads, which
shows external anal sphincter thickness measurement.
