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Three-dimensional anal endosonography may improve diagnostic confidence of detecting damage to the anal sphincter complex

Department of Radiology, Section of Ultrasound, Rigshospitalet and Department of Neurology, Bispebjerg Hospital, University of Copenhagen, Denmark

View larger version (64K): [in a new window]   Figure 1. (a) Transverse anal endosonogram (2D), corresponding to the original axial image, shows large hypoechoic defect in the external anal sphincter (arrows). (b) 3D projection of the same patient (right) shows the sphincteric defect (arrows) extending cranially (upper right) towards the rectovaginal septum.

View larger version (121K): [in a new window]   Figure 2. 3D coronal projection of the anal sphincter muscles. To the right the hypoechoic internal sphincter is clearly seen (yellow arrows), to the left hypoechoic scar tissue in the external sphincter (arrows) involves the internal anal sphincter as well (*).