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Millard-Gubler Syndrome – Causes and Treatment

Millard-Gubler Syndrome is a rare neurological condition caused by a lesion in the pons of the brainstem, leading to ipsilateral facial nerve palsy and contralateral hemiplegia.

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Things worth knowing about "Millard-Gubler Syndrome"

Millard-Gubler Syndrome is a rare neurological condition caused by a lesion in the pons of the brainstem, leading to ipsilateral facial nerve palsy and contralateral hemiplegia.

What is Millard-Gubler Syndrome?

Millard-Gubler Syndrome is a rare neurological disorder belonging to the group of alternating brainstem syndromes. It results from a unilateral lesion in the pons (part of the brainstem) and was first described in the 19th century by French physicians Auguste Louis Jules Millard and Adolphe-Marie Gubler.

The hallmark of this syndrome is the combination of an ipsilateral (same-side) facial nerve palsy (cranial nerve VII) and a contralateral (opposite-side) hemiparesis or hemiplegia of the body, caused by involvement of the corticospinal tract (pyramidal tract).

Causes

Millard-Gubler Syndrome results from lesions in the caudal (lower) pons affecting the nucleus or fibers of the facial nerve (cranial nerve VII) and the adjacent pyramidal tract fibers. Common causes include:

Ischemic stroke in the territory of the basilar artery or its branches
Hemorrhagic stroke (bleeding into the pons)
Tumors of the brainstem (e.g., gliomas)
Demyelinating diseases such as multiple sclerosis
Inflammatory conditions (e.g., encephalitis, abscess)
Traumatic brain injury

Symptoms

The classic presentation of Millard-Gubler Syndrome includes the following signs:

Ipsilateral peripheral facial palsy: Paralysis of all facial muscles on the side of the lesion (forehead, eye, mouth), characteristic of a peripheral nerve lesion
Contralateral hemiparesis or hemiplegia: Weakness or complete paralysis of the limbs on the opposite side of the body, due to damage to the pyramidal tract
In some cases, an additional ipsilateral abducens palsy (cranial nerve VI), preventing the eye from moving outward
Possible dysarthria (speech difficulty) due to involvement of motor cranial nerve nuclei
Occasional nystagmus or gaze palsies

Diagnosis

The diagnosis of Millard-Gubler Syndrome is primarily clinical, based on the characteristic combination of ipsilateral facial palsy and contralateral hemiparesis. The following investigations are used to confirm the diagnosis and identify the underlying cause:

Magnetic Resonance Imaging (MRI) of the brainstem: the preferred method for visualizing ischemia, hemorrhage, tumors, or demyelinating lesions in the pons
Computed Tomography (CT) of the head: particularly useful in acute settings to detect hemorrhage
MR or CT angiography: to assess the cerebral blood vessels
Neurological examination: detailed assessment of cranial nerve function and motor pathways
Laboratory tests: complete blood count, coagulation studies, inflammatory markers depending on clinical suspicion

Treatment

Treatment of Millard-Gubler Syndrome depends on the underlying cause:

Ischemic Stroke

In acute ischemic stroke, immediate thrombolysis (clot-dissolving therapy) or mechanical thrombectomy is the priority, provided there are no contraindications. Secondary prevention includes antiplatelet agents or anticoagulants.

Hemorrhagic Stroke

Brainstem hemorrhage requires conservative management or neurosurgical intervention depending on the size and location of the bleed.

Tumor-Related Causes

Depending on the tumor type, surgery, radiation therapy, or chemotherapy may be indicated.

Rehabilitation

Regardless of the underlying cause, intensive neurological rehabilitation is essential for improving quality of life. This includes:

Physiotherapy to improve motor function
Occupational therapy to support daily living activities
Speech and language therapy for speech and swallowing difficulties
Eye care in cases of incomplete eyelid closure (corneal protection)

Prognosis

The prognosis of Millard-Gubler Syndrome depends on the cause, the extent of the brainstem lesion, and how quickly treatment is initiated. With timely treatment of ischemic stroke, neurological deficits may partially or fully resolve. Severe lesions or delayed treatment can result in permanent disability.

References

Duus' Topical Diagnosis in Neurology. Baehr M., Frotscher M. Thieme, 5th edition, 2012.
Brandt T., Dieterich M., Strupp M. - Vertigo and Dizziness. Springer, 2nd edition, 2013.
World Health Organization (WHO) - Stroke and cerebrovascular disease. Available at: https://www.who.int (accessed 2024).

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