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Fig. 2B —Normal anatomy at mid anal canal of internal anal sphincter (IS) and
external anal sphincter (ES). Transverse endoanal T2-weighted fast spin-echo
MR image (TR/TE, 2,500/70) of 78-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 of sphincter measurements performed is given by area
between arrowheads, which shows external anal sphincter thickness
measurement.
