At the time the case was submitted for publication Khalid Alhusseiny had no financial relationships to ineligible companies to disclose.
View Khalid Alhusseiny's current disclosures
Internal anal sphincter is hypoechoic.
External anal sphincter is hyperechoic.
Levator ani muscle is hypoechoic.
Annotated images of the anal sphincter by ultrasound.
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