sentences:  Tumors of the paraganglionic tissues are known as paragangliomas, though this term tends to imply the nonchromaffin type, and can occur at a number of sites throughout the body.Chromaffin paragangliomas are issued from chromaffin cells, and are known as pheochromocytomas.Adrenal pheochromocytomas are usually benign while extraadrenal ones are more malignant.