What is Brown Sequard syndrome?
Brown Sequard syndrome is caused by a lateral hemisection of the spinal cord that severs the pyramidal tract (which has already crossed in the medulla), the uncrossed dorsal columns, and the crossed spinothalamic tract.
The region ipsilateral and below the level of the lesion demonstrates upper motor neuron weakness (paralysis), loss of tactile discrimination, loss of position sense, and loss of vibratory sense.
The ipsilateral deep tendon reflexes become hyperactive with subsequent spasticity, and an extensor plantar response develops.
Contralateral to the lesion, there is loss of pain and temperature sensation below the lesion.