Horner Syndrome

**Definition:** A syndrome associated with defective sympathetic innervation to one side of the face, including the eye. Clinical features include MIOSIS; mild BLEPHAROPTOSIS; and hemifacial ANHIDROSIS (decreased sweating)(see HYPOHIDROSIS). Lesions of the BRAIN STEM; cervical SPINAL CORD; first thoracic nerve root; apex of the LUNG; CAROTID ARTERY; CAVERNOUS SINUS; and apex of the ORBIT may cause this condition. (From Miller et al., Clinical Neuro-Ophthalmology, 4th ed, pp500-11)

**Tree numbers:** - C10.177.350 - C10.228.140.232.750 - C10.597.690.362.500 - C11.710.528.500 - C23.888.592.708.362.500

**Synonyms:** - Horner's Syndrome - Oculosympathetic Syndrome - Claude Bernard-Horner Syndrome - Ophthalmoplegia, Sympathetic Ocular - Sympathetic Ocular-Ophthalmoplegia - Bernard's Syndrome - Bernard Syndrome