Extra-Adrenal Pheochromocytoma, also known as pheochromocytoma, extra-adrenal, is related to pheochromocytoma/paraganglioma syndrome 4 and mediastinal cancer. An important gene associated with Extra-Adrenal Pheochromocytoma is SDHD (Succinate Dehydrogenase Complex Subunit D), and among its related pathways/superpathways are Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins. and glycolysis (BioCyc). Affiliated tissues include adrenal cortex and lymph node, and related phenotypes are neoplasm and normal