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A significant portion of paragangliomas (PGL) and pheochromocytomas (PCC) occur in patients with hereditary PGL/PCC syndromes, including those with germline mutations in succinate dehydrogenase (SDHx) subunit genes. Recently, germline fumarate hydratase (FH) mutations have been identified in a subset of PGL/PCC, and patients with hereditary leiomyomatosis and renal cell carcinoma (HLRCC) may have...