Brachial plexus neuropraxia during anaesthesia has been reported in multiple different surgeries and is caused by the stretching and compression of the plexus secondary to positioning. Anatomical abnormalities of the thoracic outlet with which the plexus runs through as a contributory aggravating cause of such injury has however been less discussed. 
We describe a case of brachial plexus neuropraxia after radiofrequency abalation in a patient with a previously unknown narrowed costoclavicular space and discuss ways of examining and identifying patients with thoracic outlet narrowing which can increase their risk of postoperative neuropraxia.

Brachial plexus neuropraxia after CT-guided radiofrequency ablation in a patient with a narrowed costoclavicular space