[Congenital Horner syndrome]. / Síndrome de Horner congénita.

The authors report a case of congenital Horner's syndrome. Through ophthalmological tests, it is realized a comparative study between a patient with congenital Horner's syndrome and a patient who is a carrier of this syndrome acquired by a cervical sympathectomy. We have come to the conclusion that possibly there is a congenital lesion ea the third sympathetic neuron.