Which of the following is classically diagnostic for thoracic outlet syndrome?

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Thoracic outlet syndrome is diagnosed through provocative maneuvers that specifically stress the structures passing through the thoracic outlet, causing symptoms if there’s compression. The Cyriax release test is a manual technique aimed at the scalene region and potential first-rib area; when the release reproduces or relieves the patient’s neurovascular symptoms in this region, it supports a diagnosis of compression at the thoracic outlet. Other tests listed target different problems—Spurling’s maneuver is used for cervical nerve root irritation, Sharp-Purser checks for cervical spine instability, and O’Donoghue is a knee ligament assessment—so they don’t serve as classic tests for thoracic outlet syndrome.