Which of the following statements about the diagnostic workup for TOS is most accurate according to standard clinical practice?

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In evaluating thoracic outlet syndrome, the starting point is a thorough clinical assessment—taking a detailed history and performing a focused physical exam with provocative maneuvers to reproduce symptoms and help identify whether the issue is neurogenic, vascular, or venous. This clinical evaluation is essential because there isn’t a single test that definitively confirms TOS.

Nerve conduction studies (and electromyography) aren’t diagnostic for TOS on their own; they’re used to rule out other nerve or radicular conditions that can mimic TOS and to assess for any accompanying nerve injury. They can provide useful information, but a normal or non-specific result doesn’t rule out TOS.

Imaging, such as MRI of the brachial plexus and cervical spine, complements the clinical and electrodiagnostic workup by revealing anatomic factors that could contribute to compression (like cervical ribs, scalene anomalies, or disc pathology) and by excluding other structural causes of arm symptoms. In vascular cases, additional imaging may be used, but MRI is a key piece for evaluation of possible structural contributors.

Putting it together, a comprehensive approach that includes clinical evaluation plus imaging and, when indicated, electrodiagnostic testing best reflects standard practice. That’s why all of these elements together constitute the most accurate diagnostic workup.