Avellis syndrome

Avellis syndrome is a neurological disorder marked by a distinctive form of alternating paralysis, with paralysis of the soft palate and vocal cords on one side of the body and loss of pain and temperature sensation on the other side, including the extremities, trunk and neck. It usually results from occlusion of the vertebral artery producing lesions of the nucleus ambiguus and pyramidal tract, and Horner's syndrome may accompany it; the original description involved the vagus and glossopharyngeal nerves, with involvement of neighboring cranial nerves observed later.