What is an abdominal MRI?
An abdominal MRI is a special type of magnetic resonance imaging that can show the internal organs in the abdomen in great detail. The abbreviation "MRI" stands for magnetic resonance imaging, which is an imaging method that uses strong magnetic fields and radio waves to create detailed cross-sectional pictures of the body, without any X-rays.
When is an MRI scan of the abdomen done?
An MRI of the abdomen is used when doctors want to get a very clear look at the organs in the abdominal area. These include, for example, the liver, gallbladder, spleen, pancreas, kidneys, adrenal glands, lymph nodes, and large blood vessels. This scan is often ordered when an ultrasound or computed tomography (CT) scan has not given a clear result, or when certain questions need to be answered very precisely.
Common reasons include unexplained abdominal pain, changes to organs noticed on an ultrasound, or the search for tumours, inflammation, or injuries. An abdominal MRI is also used to monitor the progress of known conditions, such as chronic liver problems. Another advantage is that this method can make even very small changes visible that might be missed by other methods.
How the scan works
Before the scan begins, you will usually be asked whether you have any metal parts or implants in your body. Because the MRI uses strong magnets, things like pacemakers, certain hearing implants, or metal fragments can cause problems. Modern implants are often MRI-compatible, but it is still important to check carefully.
During the scan, you lie still on a table that slowly moves into the tube-shaped MRI machine. The scan itself is completely painless, although the loud knocking and humming sounds of the machine can feel unusual. Because of this, headphones or earplugs are usually provided. In some cases, a contrast agent is given through a vein to make certain structures even more visible. This is generally well tolerated and is quickly removed from the body.
Depending on what is being looked at, the scan takes between 20 and 45 minutes. During this time, it is important to lie as still as possible so that the images do not blur. You may sometimes be asked to hold your breath for a few moments, which helps to keep the abdominal organs still during the scan.
What does an abdominal MRI show?
Magnetic resonance imaging produces very detailed and high-contrast pictures of the internal organs. These can reveal changes in tissue, small tumours, areas of inflammation, or cysts. Blood vessels, bile ducts, and the pancreas are also shown in great detail. In many cases, an MRI is more accurate than an ultrasound, especially for very small or hard-to-reach changes.
One big advantage is that the scan does not use any radiation, which makes it suitable for repeated check-ups. This is especially important for younger people, pregnant women (from the second trimester onwards), or those with chronic conditions.
Which organs can be seen on an abdominal MRI?
An abdominal MRI can be used to assess many important organs. These include the liver (including its segments, the liver hilum, and the hepatic veins), the bile ducts including the common bile duct (also known as the DHC), the spleen (in particular the splenic parenchyma), the kidneys, the pancreas, and the stomach including the gastric curvature, the gastric antrum, and the gastric outlet. The bowel can also be assessed in detail, including the sigmoid colon, the caecum, the terminal ileum, and signs of colitis (bowel inflammation).
The scan can also reveal possible hydronephrosis or a dilated renal pelvis when urine is not draining properly. Changes such as a lobulated pancreas (an unusually lobed pancreas) or fluid in the pouch of Douglas (a hollow space in the pelvis) may also be visible, as can ascites, which is free fluid in the abdominal cavity.
Even the abdominal wall and findings such as an umbilical hernia (belly button hernia) are shown in the scan. If needed, a tissue sample (biopsy) from any suspicious areas can be planned, usually after the imaging has been reviewed.
Are there any risks or side effects?
Magnetic resonance imaging is considered a very safe procedure. There is no radiation exposure, and the scan is painless. The contrast agent used can, in rare cases, cause allergic reactions, or may be problematic for people with serious kidney conditions. Before the scan, it is always checked whether any such pre-existing conditions exist. If you suffer from claustrophobia, you should mention this beforehand. Small measures such as listening to music through headphones or having someone with you in the room can sometimes make the scan much more comfortable.
What happens after the abdominal MRI?
After the scan, you can usually carry on with your normal day straight away. If a contrast agent was used, it is recommended to drink plenty of fluids afterwards so that it is quickly removed through the kidneys. The images are reviewed by a radiologist, who then passes the report on to your treating doctor. Depending on what was being investigated, the next steps will be discussed together.
An abdominal MRI is a modern and gentle method for getting precise answers to many different questions about the abdomen. It helps to detect conditions early, treat them in a targeted way, or monitor the progress of a known illness.
