Thoracic outlet syndrome with right subclavian artery dilatation in a child - transaxillary resection of the pediatric cervical rib.

Cervical rib is a well-documented congenital anomaly, and thoracic outlet syndrome (TOS) with vascular compression is extremely rare in childhood. The subclavian artery, subclavian vein, brachial plexus, or a combination of these can be affected in this syndrome. We present a case of TOS in an eight-year-old boy and describe the rare finding of subclavian artery compression with post-stenotic dilatation and severe brachial plexus compression symptoms. The patient underwent right transaxillary resection of the first thoracic and cervical rib. The presentation is unique and may be elusive.