What is a brain tumor?

A brain tumor is defined as a group of abnormal cells that grow uncontrollably within the brain or surrounding structures. Unlike normal cells, which maintain regulated growth and function, abnormal cells do not respond to the body’s normal regulatory mechanisms. They can divide and multiply excessively, leading to a mass or lesion that can interfere with normal brain function. Depending on their genetics, structure, and the location of growth, brain tumors can vary in their behavior, classification, and treatment options. This distinction is critical because a brain tumor's abnormal cell composition sets it apart from other medical conditions, such as seizures or genetic disorders, which can involve different mechanisms and types of clinical manifestations.