Wallenberg Syndrome is most commonly caused by a stroke in the brain stem. However, trauma to the vertebral artery, a blood vessel in the neck, can also prompt the condition, as can an aneurysm or inflammation in the artery. Head injury, multiple sclerosis, metastatic cancer, and varicella infections can cause Wallenberg syndrome to develop. In rare cases, an unusual form of tuberculosis -- brain stem tuberculoma -- precedes the condition.
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