👉 Oligodendroglioma is a type of cancer that affects the nerves and brain cells in the spinal cord. It's one of the most common types of brain tumors, affecting around 10% of people with cancer. The tumor starts from the lining of the nerve cell axon (the long fibrous tube that carries signals to the brain) and spreads through the spinal cord. This can cause symptoms like numbness or weakness in the arms, legs, or back. Treatment options