Horner's syndrome and bilateral esophageal duplications.

Bilateral esophageal duplications are exceptionally rare. A 3-month-old male presented with a left-sided Horner's syndrome. Upon further investigation, bilateral upper thoracic masses with an air-fluid level within the right-sided mass were found. Sequential thoracotomies at 1-week intervals confirmed the presence of bilateral esophageal duplications. At 1 year of age the patient is growing normally and is asymptomatic except for a persistent Horner's syndrome. We believe this to be the first case of bilateral esophageal duplication cysts presenting with Horner's syndrome.