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Fig. 2 —Transverse T2-weighted fast spin-echo (TR/TE, 2,500/70)
external phased-array MR image in 56-year-old woman shows internal anal
sphincter (IS) as homogeneously isointense to hypointense circular band
surrounding anal canal. Difference of internal anal sphincter signal intensity
with external phased-array coil is most likely related to higher spatial
resolution of endoanal examination. ES = external anal sphincter, TPM =
transverse perineal muscle, IAS = ischioanal space.
