Account for about 20% of childhood CNS tumors.
Increased incidence of 10% reflects improved MRI imaging.
Median age the presentation for children 6-7 years, with equal gender representation.
Less frequent in adults but has been reported to occur up to the age of 70 years.
Less aggressive course in adults compared to children.
Increased frequency in patients with neurofibromatosis type I and associated with an indolent course.