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Brown-Sequard syndrome reflects a hemisection of the spinal cord, where one side is damaged and disrupts specific tracts to produce a characteristic pattern: motor and vibration/proprioception loss on the same side as the injury, plus pain and temperature loss on the opposite side a short distance below. The mechanism is best explained by a unilateral disruption of the corticospinal and dorsal columns on the affected side, with the contralateral spinothalamic fibers already crossing to the opposite side and thus causing sensory loss there.

Penetrating injuries, such as stab wounds or gunshot wounds, are the classic cause because they can slice through one half of the spinal cord, creating a clean hemisection. This direct transection on one side readily yields the Brown-Sequard pattern. Other causes like blunt trauma, degenerative changes, or ischemic events can produce various spinal cord deficits, but they don’t typically create the textbook hemisection presentation as cleanly or predictably as penetrating injuries do.