Which condition is NOT typically differentiated from thoracic outlet syndrome by neurological examination?

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The main idea is that thoracic outlet syndrome is a peripheral entrapment issue affecting the brachial plexus or nearby vessels, so you differentiate it from other arm problems by looking for patterns that point to specific peripheral nerves or plexuses. Carpal tunnel syndrome, peripheral neuropathy, and radial nerve entrapment each produce distinct, focal findings that map to particular nerve distributions, making them recognizable on a neurological exam.

Cervical myelopathy, however, is a central problem located in the cervical spinal cord. Its arm symptoms can resemble those from peripheral causes, especially early on, and the neurological exam focused only on the arm may not reliably distinguish it from thoracic outlet syndrome. Features that would set cervical myelopathy apart—such as upper motor neuron signs (hyperreflexia, spasticity, clonus), involvement beyond the arm (gait changes, hand weakness with extensor plantar responses)—may be subtle or absent initially. Because of that, cervical myelopathy is not typically ruled in or ruled out solely by an arm-focused neurological exam; cervical spine imaging and a broader neurologic assessment are often required to identify it.