Brain Tumors in Children What is a brain tumor? Brain tumors are the most common solid tumors in children. Approximately 1,500 children in ...

What is the brain? The brain is a soft, spongy mass of tissue. It is protected by the bones of the skull and three thin membranes called meninges. Watery fluid called cerebrospinal fluid cushions the brain. This fluid flows through spaces between the meninges and through spaces ...