What is an Endoanal Ultrasound?

Texto disponível em Português.

An Endoanal Ultrasound is a test that allows the doctor to evaluate in depth, using ultrasonography, the different constituents of the wall of the anal canal and the latter part of the rectum, as well as the surrounding area.

Why is Endoanal Ultrasound necessary?

It is a very accurate technique in the preoperative staging of tumours of the rectum and the anal canal, and in the study of benign anorectal pathology, such as abscesses, fistulas or assessment of cases of fecal incontinence.

What does the Endoanal Ultrasound involve?

OThe examination involves inserting a rigid ultrasound probe through the anus, which the doctor will insert slowly. This probe has an ultrasound transducer built into its extremity that can cover, on a single plane, the entire circumference of the anal canal.

Use of rigid anorectal ultrasound probe
Use of rigid anorectal ultrasound probe

You should prepare as indicated, in order to properly clean the inside of the intestine.

The examination is executed with the patient lying on his or her left side, with his or her back to the doctor. However, if necessary, you may be asked to change positions during the examination.

The examination usually takes between 15 and 30 minutes.

It is generally a well-tolerated examination, performed on an outpatient basis without the need for sedation or analgesia.

You might experience some abdominal discomfort and the feeling of wanting to defecate. These complaints improve with the removal of the device or a few minutes after the end of the examination.

After the examination, you can eat normally and resume your usual activities.


What are the possible complications?

Endoanal Ultrasound is usually a very safe and well tolerated procedure. While there may be complications (bleeding, perforation), these are rare, and in some cases may be resolved with conservative medical therapy or using endoscopic techniques. However, there may be a need for surgery. If, after the examination, you feel any new complaint that worries you, contact the Endoscopy Unit where the procedure was performed or the Accident and Emergency department of the nearest Hospital.



This information is only intended to provide general guidance, and is not a substitute for specific medical advice. It is essential that you discuss your specific medical condition with your doctor.