Bilateral rudimentary first ribs as a cause of thoracic outlet syndrome.

First rib abnormalities are an uncommon cause of thoracic outlet syndrome. Cervical ribs are a much more frequent source of thoracic outlet syndrome, and in more than 95% of these patients, the symptoms are neurologic, not vascular. Rudimentary first ribs, however, uncommonly produce exclusively neurologic symptoms and usually manifest with vascular pathology. This article reviews a case of a patient with bilateral extensively neurologic thoracic outlet syndrome symptoms arising from bilateral rudimentary first ribs. The symptoms, pathologic features, and treatment, as well as an algorithm for working up patients with thoracic outlet syndrome, are discussed. Bilateral transaxillary first rib resection was curative in this patient and is the treatment of choice for either neurologic or vascular manifestations of thoracic outlet syndrome associated with rudimentary first ribs.