ON THIS PAGE: You will find a list of common tests, procedures, and scans that doctors use to find the cause of a medical problem. Use the menu to see other pages.
Doctors use many tests to find, or diagnose, a brain tumor. Doctors may also do tests to learn which treatments could work best.
For most tumor types, a biopsy is the only sure way for the doctor to know if an area of the body has a tumor. In a biopsy, the doctor takes a small sample of tissue for testing in a laboratory. If a biopsy is not possible, the doctor may suggest other tests that will help make a diagnosis.
How DIG is diagnosed
There are many tests used for diagnosing DIG. Not all tests described here will be used for every child. Your child’s doctor may consider these factors when choosing a diagnostic test:
The type of tumor suspected
Your child’s signs and symptoms
Your child’s age and general health
The results of earlier medical tests
In addition to a physical examination, the following tests may be used to diagnose DIG:
Computed tomography (CT or CAT) scan. A CT scan takes pictures of the inside of the body using x-rays taken from different angles. A computer combines these pictures into a detailed, 3-dimensional image that shows any abnormalities or tumors. A CT scan can be used to measure the tumor’s size. Sometimes, a special dye called a contrast medium is given before the scan to provide better detail on the image. This dye is usually injected into a patient’s vein.
Magnetic resonance imaging (MRI). An MRI uses magnetic fields, not x-rays, to produce detailed images of the body. MRI can be used to measure the tumor’s size. A special dye called a contrast medium is given before the scan to create a clearer picture. This dye is usually injected into a patient’s vein.
Biopsy. A biopsy is the removal of a small amount of tissue for examination under a microscope. Other tests can suggest that cancer is present, but only a biopsy can make a definite diagnosis. A pathologist then analyzes the sample(s). A pathologist is a doctor who specializes in interpreting laboratory tests and evaluating cells, tissues, and organs to diagnose disease.
After diagnostic tests are done, your child’s doctor will review the results with you. If the diagnosis is DIG, these results also help the doctor describe the tumor. This is called staging and grading.
The next section in this guide is Stages and Grades. It explains the system doctors use to describe the extent of the disease. Use the menu to choose a different section to read in this guide.