Horner syndrome (bernard-horner syndrome; cervical sympathetic paralysis syndrome; claude- bernard-horner syndrome; horner oculopupillary syndrome) 5

General: Paralysis of cervical sympathetic; hypothalamic lesion with first neuron involved or lesion in the pons or cervical portion of cord; syndrome present in Babinski-Nageotte, Cestan-Chenais, Dejerine-Klumpke, Pancoast, Raeder, and Wallenberg syndromes (see Babinski-Nageotte Syndrome; Cestan-Chenais Syndrome; Dejerine-Klumpke Syndrome; Pancoast Syndrome; Raeder Syndrome; Wallenberg Syndrome).

Ocular: Enophthalmos; ptosis or narrowing of palpebral fissure; ocular hypotony; miosis (degree of miosis depends on site of lesion; most pronounced when roots of cranial nerves VII and VIII and first thoracic nerve are involved); hypochromic heterochromia (children more than adults); pupil does not dilate with cocaine.

Clinical: Anhidrosis on ipsilateral side of face and neck; transitory rise in facial temperature; hemifacial atrophy; may result from a variety of conditions, including cluster headache, parasellar neoplasms or aneurysms, internal carotid dissection or occlusion, and Tolosa-Hunt syndrome.

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