Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Childhood Brain Tumors ?
    ### Response:
    Brain tumors are abnormal growths inside the skull. They are among the most common types of childhood cancers. Some are benign tumors, which aren't cancer. They can still be serious. Malignant tumors are cancerous.    Childhood brain and spinal cord tumors can cause headaches and other symptoms.
    