Head and neck paragangliomas: an overview.

Paragangliomas of the head and neck are unique tumors. Their pathology, tissue of origin, location, genetics, potential for bio-chemical activity, multicentricity, and growth pattern are unusual compared with more common head and neck tumors. Because these tumors are widespread and can appear in the ear, neck, larynx, nose, orbit, and chest, they cross subspecialties of otolaryngology.