<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by nonsyndromic paraganglioma ? [/INST] It is estimated that the prevalence of pheochromocytoma is 1 in 500,000 people, and the prevalence of other paragangliomas is 1 in 1 million people. These statistics include syndromic and nonsyndromic paraganglioma and pheochromocytoma. </s>