FIGURE 2.

(A1) Shows 2D and 3D images from HRAM showing sphincter defects indicated by low pressures (red arrows). (A2) shows a normal 2D and 3D anorectal manometry5. (B1) TRUS shows both the intact parts of the IAS, (red arrow—inner hypoechoic ring) with defect extending from 3 to 9 o’clock and EAS, (yellow arrow—outer hyperechoic ring) with a defect from 5 to 8 o’clock. (B2) shows a normal TRUS image of normal sphincters. Normally the IAS and EAS are complete circles with no interruption. EAS = external anal sphincter; HRAM = high resolution anorectal manometry; IAS = internal anal sphincter; TRUS = transrectal ultrasonography.