Upper limb gangrene due to a subclavian arterial thrombosis associated with thoracic outlet syndrome following cervical spondylotic amyotrophy.

Thoracic outlet syndrome (TOS) refers to an abnormal compression of the subclavian vessels and the brachial plexus at the base of the neck or thoracic outlet. The authors described a novel case of a 66-year-old male with arterial TOS and unilateral upper rib dysplasia following cervical spine disease. Owing to the comorbidity of cervical spondylotic amyotrophy and a history of sloping shoulder due to rib dysplasia, TOS occurred, which subsequently led to subclavian arterial thrombosis and eventually resulted in the gangrene of the hand. Thrombectomy and surgical resection of the first and second ribs avoided the progression of further neurovascular disorder. When treating a cervical spondylotic patient, concurrent TOS can be obscured by symptoms caused by cervical lesions, leading to difficulty in identifying the origin of these neurovascular findings. The possibility of subsequent thromboembolic events based on TOS should be considered, especially in cases with dysplasia of the upper ribs.