The demographic patterns of<unk>  are not well described because the tumor is rare. In addition, most cancer registries collect data only on malignant conditions and, therefore, they are not useful in the study of<unk>  which is considered to be a borderline histological malignancy. Incidence rates are similar in males and females and between caucasians and African Americans. Tumors are more common among children of age 5 to 15 years and older adults of greater than 65 years, while the lowest rates occur among those aged 15 to 34 years. Survival is highest for patients diagnosed at a younger age.
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