<unk>  and<unk>  tumors are uncommon, they represent 0.2% of all neoplasms in general population. The prevalence of<unk>  and<unk>  tumors is approximately 0.9 per 100,000 individuals.<unk>  and<unk>  tumors have a bimodal age distribution. These tumors are more frequent in children and adolescents, and older adults.  The average age at diagnosis is between 10-25 years old and 60-75 years old. Males are more commonly affected than females, with a 1.5:1 ratio.<unk>  and<unk>  tumors are slightly more common among individuals of Caucasian race.
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