Endoanal Ultrasound

What is it?

An endoanal ultrasound is an examination of the back passage (anus). This shows the muscles of the sphincter and may also be used to investigate anal fistula.

What preparation is needed for the examination?

None.

What exactly happens during the examination?

You will be taken to the examination room, where the procedure will be explained to you.

The examination will be performed by a consultant radiologist. You will have to lie, either on your left side or on your front, and then just the end of the ultrasound probe, which is the size of a large finger, will be inserted a couple of inches into the bottom.

Ultrasound is entirely harmless and does not involve any radiation.

Does the procedure hurt?

Unless you have a painful anal condition, the insertion of the probe will cause only mild discomfort.

How long will it take?

The examination only takes about 10 minutes.

When will I get the results?

You can discuss the findings with the radiologist immediately afterwards. The radiologist will also send films and report to your doctor.

Aftercare?

None.