: Thymus Gland CT (Computed Tomography)

: What the Thymus Gland Is

: The thymus is a small organ located in the upper chest behind the breastbone. It plays an important role in the immune system, especially during childhood, by helping T-lymphocytes (a type of white blood cell) mature. The thymus is largest in children and gradually shrinks with age.

: How the Test Is Performed

: During a CT scan, you lie on a table that slides into a doughnut-shaped machine. The scanner takes multiple X-ray images from different angles to build detailed pictures of the thymus. A contrast dye may be given by mouth or injection to make the images clearer. The test is painless and usually takes only a few minutes.

: Why the Test May Be Ordered

: Your healthcare provider may order a thymus CT if you have symptoms or findings that suggest a thymus problem, such as a mass seen on another imaging study, symptoms of myasthenia gravis, or unexplained chest symptoms. It can help identify an enlarged thymus, tumors, cysts, or other structural abnormalities.

: What to Expect

: You may be asked to remove metal objects and jewelry before the scan. If contrast dye is used, you may need to avoid food or drink for a few hours beforehand. Most people can return to normal activities right after the test. A radiologist reviews the images and sends a report to your provider.