Thoracic outlet and pectoralis minor syndromes

Area of Science:

• Orthopedics
• Neurology
• Vascular Surgery

Background:

• Neurovascular compression in the upper extremity can manifest as thoracic outlet syndrome (TOS) above the clavicle or pectoralis minor syndrome below it.
• The brachial plexus is most commonly affected (over 90%), followed by venous (5%) and arterial (1%) obstruction.
• Understanding the distinct clinical presentations, pathologies, and etiologies of neurogenic, venous, and arterial TOS is crucial.

Purpose of the Study:

• To differentiate between TOS and pectoralis minor syndrome based on clinical presentation, diagnostic testing, and treatment approaches.
• To review the diagnostic modalities necessary for distinguishing between neurogenic, venous, and arterial TOS.
• To recommend appropriate medical and surgical interventions for each compression syndrome.

Main Methods:

• Literature review focusing on the clinical presentation, diagnostic criteria, and treatment outcomes for TOS and pectoralis minor syndrome.
• Comparative analysis of diagnostic testing protocols for differentiating neurogenic, venous, and arterial TOS.
• Synthesis of current evidence regarding the efficacy of conservative and surgical management strategies.

Main Results:

• Neurogenic TOS, involving the brachial plexus, is the most frequent type, while venous and arterial TOS are less common but carry significant risks.
• Accurate diagnosis through specific tests is essential for tailoring treatment to the underlying compression type.
• Long-term outcomes are influenced by the duration of symptoms and promptness of intervention, with over 80% of patients potentially achieving functional improvement.

Conclusions:

• Thoracic outlet syndrome and pectoralis minor syndrome require distinct diagnostic and therapeutic approaches.
• Early and accurate diagnosis is key to optimizing functional recovery in patients with upper extremity compression syndromes.
• While most patients can expect functional improvement, arterial and venous TOS generally have better outcomes than neurogenic compression.