The Treaty of Fort Laramie (also called the Sioux Treaty of 1851) was an agreement between the United States and the Oglala, Miniconjou, and BrulÃ© bands of Lakota people, Yanktonai Dakota and Arapaho Nation signed on April 29, 1868 at Fort Laramie in the Wyoming Territory, guaranteeing the Lakota ownership of the Black Hills, and further land and hunting rights in South Dakota, Wyoming, and Montana.
Tumors may occur at any age, but many types of tumors are most common in a certain age group. In adults, gliomas and meningiomas are most common. Gliomas come from glial cells such as astrocytes, oligodendrocytes, and ependymal cells. The gliomas are divided into three types: Astrocytic tumors include astrocytomas (can be noncancerous), anaplastic astrocytomas, and glioblastomas.
Primary brain tumors are tumors that form from cells within the brain. The tumors are categorized by the type of cell in which it first develops. There are over 120 different types of brain tumors, according to the National Brain Tumor Society. The most common primary brain tumors are called gliomas, which originate in the glial (supportive) tissue. About one third of all primary brain tumors and other nervous system tumors form from glial cells.