Abstract
Pheochromocytomas and Paragangliomas are neuroendocrine tumors derived from chromaffin cells. Approximately 15-20% of Pheochromocytomas and Paragangliomas are classified as metastatic, defined by the presence of tumor in non-chromaffin tissues. To date, at least 20 susceptibility genes for PPGLs have been reported. Germline pathogenic variants in SDHB gene are the most well-established ri…