Endoanal ultrasound in continence workups is most associated with which finding?

• A. It assesses urinary bladder capacity.
• B. It measures anal sphincter pressures.
• C. It visualizes the anal mucosa for ulcers.
• D. It visualizes the anal sphincter anatomy to detect defects or tears contributing to incontinence.

Answer: (D)

Endoanal ultrasound is used to visualize the anal sphincter complex and identify structural defects that can cause incontinence. It shows the internal and external sphincters, their thickness, and any tears or defects (often from childbirth or prior surgery) that disrupt continence. This information directly informs treatment decisions, such as planning a sphincter repair or targeted intervention. It does not assess how much the bladder can hold, which is evaluated with urodynamics; it does not measure anal sphincter pressures, which are obtained by anorectal manometry; and it does not predominantly look for anal mucosal ulcers, which are more typically assessed with endoscopic exams. So its primary association in continence workups is visualizing sphincter anatomy to detect defects or tears contributing to incontinence.