Endoanal ultrasound


A type of medical investigation which images the structure of the anal canal

Enquiries & Appointments

Endoscopy at The Princess Grace Hospital

Our Endoanal ultrasound locations

The Princess Grace Hospital

The Princess Grace Hospital

42-52 Nottingham Place W1U 5NY London
The Shard Outpatients

The Shard Outpatients

The Shard, 32 St Thomas Street SE1 9BS London
London Bridge Hospital

London Bridge Hospital

27 Tooley Street SE1 2PR London


An endoanal ultrasound is used to demonstrate either childbirth trauma or post surgical trauma to the sphincter.

This is a muscle that maintains constriction of a natural body passage, such as the anus. It may also show abnormal thinning of an intact internal sphincter, associated with incontinence.

Need to know

In the treatment room you will be asked to lie down on an examination table and given a local anaesthetic to numb your throat. Your consultant will then carefully feed the endoscope down your oesophagus (the tube connecting your mouth to your stomach) into your small intestine. A small camera at the end of the endoscope will send images to a monitor. The endoscope pumps air into your stomach and small intestine, making it easier for your consultant to view inside your intestine. They may also inject a special dye to make the ducts more visible under X-ray. Your consultant will locate the opening where the bile and pancreatic ducts empty into the small intestine and place a catheter into the ducts.

Your consultant will provide information on preparation before your ERCP.

Having an endoscope inserted, will likely mean you will experience a sore throat for several days following the procedure. You may also experience bloating or nausea. These symptoms should pass. You should be able to return home on the same day, but may have to stay in hospital overnight depending on the rate of your recovery. Your consultant will share your results with you once you have recovered.

This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.