Prospective Study
Copyright ©The Author(s) 2017.
World J Gastroenterol. Jun 7, 2017; 23(21): 3900-3906
Published online Jun 7, 2017. doi: 10.3748/wjg.v23.i21.3900
Figure 1
Figure 1 Internal anal sphincter thickness is defined as the mean thickness of the internal anal sphincter at 12, 3, 6, 9 o’clock positions in the mid-axial plane. IAS: Internal anal sphincter; EAS: External anal sphincter.