Correction to: Quantifying the extent of fistulotomy. How much sphincter can we safely divide? A three-dimensional endosonographic study.

In the Fig. 1 of the original published version of this article the numbers were switched as well as in the text of Results section, lines 5 and 6. The revised figure and the corrected text are now presented correctly in this article.

Quantifying the extent of fistulotomy. How much sphincter can we safely divide? A three-dimensional endosonographic study.

Purpose: To quantify the longitudinal division of the internal anal sphincter (IAS) and external anal sphincter (EAS) after fistulotomy using three-dimensional endoanal ultrasound (3D-EAUS) and correlate the results with postoperative faecal incontinence.

Methods: A prospective, consecutive study was performed from December 2008 to October 2010. All patients underwent 3D-EAUS before and 8 weeks after surgery.