After childhood cerebral astrocytoma has been removed, tests are done to find out if there is tumor remaining. The extent or spread of cancer is usually described as stages. For childhood cerebral astrocytoma, the grade of the tumor is used instead of stages. The grade of the tumor refers to how abnormal the cancer cells look under a microscope and how quickly the tumor is likely to grow and spread. It is important to know the grade of the tumor and if there were any cancer cells remaining after surgery in order to plan treatment.

The following grades are used for childhood cerebral astrocytoma:

• Low grade cerebral astrocytoma: Tumors that are very slow-growing and rarely spread.
• High grade or malignant cerebral astrocytoma: Tumors that are fast-growing and may spread throughout the brain.

The following procedure may be used to determine if any cancer cells remained in the brain after surgery:

• MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the brain and spinal cord. A substance called gadolinium is injected into the patient through a vein. The gadolinium collects around the cancer cells so they show up brighter in the picture. This procedure is also called nuclear magnetic resonance imaging (NMRI).

Cerebral astrocytomas may form at more than one place in the brain and do not usually spread to other parts of the body.