Patient Info

Endoanal/Rectal Ultrasound

This is a procedure in which an ultrasound probe is inserted into the anus or rectum.  The sound waves bounce off tissues or organs displaying the internal structures.  Transrectal ultrasound may be used to look at a rectal cancer/adenoma and nearby structures in order to determine their depth of growth and spread. This determines possible further treatment. This may be used in combination with a rectal MRI scan.

Endoanal ultrasound is used to look at the layers of the anal sphincter muscle (continence muscle) and to identify possible injuries. It can also be used to identify perianal abscesses and fistulas. Ultrasound is painless however the procedure will be uncomfortable. This is a very easy procedure.  Unlike other imaging techniques, it uses no radiation and thus requires no special precautions.

Procedure

Usually the patient lies on their side on the examination table.  A small amount of water soluble gel is applied over the area or in the rectum.  The gel does not harm your skin or internal organs and can be wiped off after the procedure.  A ultrasound probe is covered with a protective covering and inserted in the patient.  The probe is small and there is a minimal amount of discomfort associated with the procedure itself.  Once inserted, your surgeon moves the probe forward and backward to best evaluate the area being examined.  This procedure generally takes five to ten minutes.  Afterwards your surgeon will interpret and inform you of the results and send a report back to your referring doctor.

Preparation

The patient requires no anaesthetic or sedation, and no special bowel preparation is required.

Risks

Multiple studies have shown that the sound waves used with ultrasound imaging are harmless and may be directed at patients with complete safety.  The procedure is painless although you may feel a little discomfort during the procedure.

 

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