الفهرس 
3D endoanal ultrasonographic changes in anorectal morphologic parameters after fistula-in-ano surgery
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Abstract
The purpose of the study is to quantify the extent of the perianal fistula preoperatively and the extent of longitudinal division of the internal anal sphincter (IAS) and external anal sphincter (EAS) after fistulotomy / ectomy using three dimensional endoanal ultrasound (3D-EAUS) and compare the results with postoperative fecal incontinence. A prospective, consecutive study was performed from November 2012 to June 2013. Twenty one patients with different types of perianal fistulae were included. Clinical history and physical examination was performed in all patients to exclude cases which do not match with the criteria followed by 3D EAUS to confirm the diagnosis and quantify the fistula height. 3D EAUS was repeated 4 weeks after surgery to quantify the extent of the sphincter division after fistula in-ano surgery. Quantitative millimeter measurements were taken in all patients of the following variables: Total length of the anal canal. Length of the puborectalis muscle. Length of the EAS. Length of the IAS. The percentage of involved EAS and IAS by the fistula is calculated preoperatively. The percentage of divided sphincter is calculated after fistula surgery. Anal incontinence was evaluated using the Jorge and Wexner scale (JW) and soiling is evaluated using a modification of the JW score