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While 60% of study participants had intact external and internal anal sphincters seen on endoanal ultrasound, and 30% had an isolated external anal sphincter defect only, the remaining 10% of participants had either defects in both sphincters or such profound distortion of the sphincters that the anatomy was not interpretable.
In one study of 64 patients, digital rectal examination performed by an experienced colorectal surgeon yielded 63% sensitivity and 57% specificity for internal anal sphincter pathology, and 84% sensitivity and 57% specificity for external anal sphincter pathology.
In one study of 64 patients, digital rectal exam performed by an experienced colorectal surgeon yielded 63% sensitivity and 57% specificity for internal anal sphincter pathology, and 84% sensitivity and 57% specificity for external anal sphincter pathology.

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