Astrocytoma is a type of brain tumor that originates from astrocytes, which are star-shaped cells in the brain and spinal cord. These tumors can vary in grade, with lower-grade astrocytomas being slower-growing and higher-grade ones being more aggressive. Symptoms may include headaches, seizures, and changes in cognitive function, depending on the tumor's location. Diagnosis typically involves imaging tests like MRI and may require a biopsy to determine the tumor's grade. Treatment options often include surgery, radiation therapy, and chemotherapy, aimed at removing or controlling the tumor while minimizing damage to surrounding brain tissue.