It occurs when there is damage to the dorsolateral or posterior lateral medulla oblongata, likely syphilitic in origin.

Another instance of this test is where the affected patient is laying flat on their back, also known as supine position, with their hands crossed on their chest.

They attempt to sit up and the affected thigh is flexed with the heel raised up and the unaffected side of the body stays flat.

The magnetic resonance imaging (MRI) data from this study showed that the syndromes are not identical in appearance.

[8] Horner's syndrome is the disruption of a nerve pathway from the brain to the face and eye on one side of the body.

Nageotte earned his medical degree in 1893, and specialized in research of the nervous system, and the importance of microscopic anatomy.

In one case this syndrome occurred in a woman that was 10 days into her postpartum period and had delivered her baby via Cesarean section.

She had complaints of dysarthria, dysphagia, dizziness, nausea, vomiting, and weakness of left arm and leg.

[10] The only background health information found was she had given birth via Caesarean section 10 days prior and was diagnosed with preeclampsia in her 33rd week of pregnancy.

During their first evaluation, it was noted that they appeared to be in a stuporous state and had dysarthric speech, eye movement was examined and found vertical and horizontal nystagmus.

During cranial examination there was flattening of left sided nasolabial sulcus with abnormal gag reflex observed.

Evaluation of the cranial MRI screening of the patient with the misdoubt of cerebrovascular disease showed results that were consistent with diffusion restriction which was thought to be acute infarct extending to inferior cerebellar peduncle with involvement of right sided posterolateral medulla oblongata.

Right Horner's syndrome, right facial paresis, dysphagia, and paralysis of the right soft palate and ride side of the tongue were present.

Cranial MRI showed a right hemi medullary infarct, and magnetic resonance angiography showered severe stenosis of the right vertebral artery.