HORNERS SYNDROME, PUPIL
\hˈɔːnəz sˈɪndɹə͡ʊm], \hˈɔːnəz sˈɪndɹəʊm], \h_ˈɔː_n_ə_z s_ˈɪ_n_d_ɹ_əʊ_m]\
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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)
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