Carney-Stratakis syndrome (CSS), a rare condition characterized by paragangliomas and/or pheochromocytomas and gastrointestinal stromal tumors (GIST), is caused by germline heterozygous pathogenic variants in the succinate dehydrogenase subunit genes (SDHB, SDHC, SDHD). Here, SDHD is linked to hereditary pheochromocytoma-paraganglioma.