<unk>  (also known as crossed<unk>  is a form of<unk>  that has an ipsilateral cranial nerve palsies and contralateral<unk>  or hemiparesis of extremities of the body. The disorder is characterized by recurrent episodes of paralysis on one side of the body. There are multiple forms of<unk> , Weber's syndrome, middle<unk> , and inferior<unk> . This type of syndrome can result from a unilateral lesion in the brainstem affecting both upper motor neurons and lower motor neurons. The muscles that would receive signals from these damaged upper motor neurons result in spastic paralysis. With a lesion in the brainstem, this affects the majority of limb and trunk muscles on the contralateral side due to the upper motor neurons decussation after the brainstem. The cranial nerves and cranial nerve nuclei are also located in the brainstem making them susceptible to damage from a brainstem lesion. Cranial nerves III (Oculomotor), VI (Abducens), and XII (Hypoglossal) are most often associated with this syndrome given their close proximity with the pyramidal tract, the location which upper motor neurons are in on their way to the spinal cord. Damages to these structures produce the ipsilateral presentation of paralysis or palsy due to the lack of cranial nerve decussation (aside from the trochlear nerve) before innervating their target muscles. The paralysis may be brief or it may last for several days, many times the episodes will resolve after sleep. Some common symptoms of<unk>  are mental impairment, gait and balance difficulties, excessive sweating and changes in body temperature.
Alternating hemiplegia
Spastic diplegia
Spastic hemiplegia
Triplegia
Harding ataxia
Dissociated sensory loss
Tetraplegia
Paraplegia