[Chemodectoma of nerve X. Value and interest of the concept of the diffuse paraganglionic system].

Tenth nerve chemodectoma is one of the rarest varieties of cervicocephalic paragangliomas, far behind tumors developed from the carotid body. Based on findings in three patients, one reported previously, clinical and biological features of these formations are discussed. Recent data and those from personal studies are exposed, and arguments presented enabling the concept to be defended of a diffuse paraganglionic system in relation with the vagus nerve.