Published online by Cambridge University Press: 02 November 2023
Thoracic outlet syndrome (TOS) is a rare, often perplexing disorder caused by compression of neurovascular structures, just above the first rib and behind the clavicle or under the pectoralis minor, leading to cervicogenic–brachial pain and other symptoms in neck and upper limb. This chapter reviews the subtypes of TOS, such as neurogenic and vasogenic, illustrates the anatomy of the thoracic outlet and discusses the common sites of nerve entrapment.
Botulinum neurotoxin (BoNT) is an emerging treatment for TOS. Intramuscular injection of BoNT reduces muscle spasm and produces denervation atrophy of hypertrophied muscles, relieving compression of neurovascular structures and ameliorating both neurogenic and vasogenic symptoms. Risks associated with injection and the BoNT itself make guidance and targeting techniques important. Therefore, ultrasound (US) guidance for accurate injection placement is stressed. This chapter will briefly review TOS and the literature related to use of BoNT for TOS and also provide a detailed review of procedural techniques for US guidance.
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