<prompt> Pheochromocytoma is a neoplasm derived fromChromaffin cellsParaganglia in neckAn adrenal gland tumor due to nephrogenic restPrimitive totipotential cells  <response>: Pheochromocytomas are neoplasms composed of chromaffin cells, which synthesize and release catecholamines and in some instances peptide hormones. Pheochromocytomas that develop in extra-adrenal paraganglia are designated paragangliomas Robbins 9e pg: 1134 Ref img 