Several tests may be used to diagnose brain tumors, including:

• Physical exam and history
• Neurologic exam The doctor checks for alertness, muscle strength, coordination, reflexes and response to pain. The doctor also examines the eyes to look for swelling caused by a tumor pressing on the nerve that connects the eye and brain.
• CT or CAT (Computerized Axial Tomography) scan This procedure uses a computer connected to an X-ray machine to obtain detailed pictures of areas inside the body. A dye may be used to help visualize organs or tissues more clearly.
• MRI (magnetic resonance imaging) MRI creates a series of detailed pictures of areas inside the body, using the combination of a powerful magnet, radio waves and computer imaging.
• Biopsy Tissue samples are examined under the microscope to determine what types of cells are present.