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Bonnet-Dechaume-Blanc Syndrome – Definition & Treatment

Bonnet-Dechaume-Blanc Syndrome is a rare congenital vascular malformation affecting the retina, brain, and face. It belongs to the group of neurocutaneous phakomatoses.

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Things worth knowing about "Bonnet-Dechaume-Blanc Syndrome"

Bonnet-Dechaume-Blanc Syndrome is a rare congenital vascular malformation affecting the retina, brain, and face. It belongs to the group of neurocutaneous phakomatoses.

What is Bonnet-Dechaume-Blanc Syndrome?

Bonnet-Dechaume-Blanc Syndrome (also known as Wyburn-Mason Syndrome or retinocephalic vascular malformation syndrome) is a very rare congenital disorder classified among the phakomatoses – a group of conditions characterized by the development of benign tissue overgrowths (hamartomas) at multiple sites in the body. The syndrome is defined by the simultaneous presence of arteriovenous malformations (AVMs) in the retina, the brain, and occasionally the face. Arteriovenous malformations are abnormal connections between arteries and veins that bypass the normal capillary network, leading to high-pressure shunting of blood.

Causes and Development

Bonnet-Dechaume-Blanc Syndrome arises from a developmental defect of blood vessels during embryonic growth. The exact genetic cause has not been fully established. The condition is typically sporadic, meaning it occurs without a familial pattern and does not follow a classic Mendelian inheritance mode. The vascular malformations most likely develop between the 4th and 8th weeks of gestation, during the critical period of central nervous system vascular formation.

Symptoms

The clinical presentation of the syndrome varies widely between individuals. Symptoms predominantly affect the eyes, the brain, and – less commonly – the face:

Ocular Symptoms

Vision loss or visual impairment caused by retinal AVMs
Abnormal, tortuous vascular patterns in the retina visible during eye examination
Optic disc swelling (papilledema) or optic atrophy in advanced cases

Neurological Symptoms

Headaches, often related to increased intracranial pressure
Epileptic seizures
Hemiparesis (one-sided weakness) or other motor deficits
Intracranial hemorrhage due to rupture of a cerebral AVM – a life-threatening emergency
Cognitive impairment or memory difficulties

Facial Findings

Vascular anomalies of the face, particularly involving the jaw or oral mucosa
Occasionally, reddish skin lesions (port-wine stain or naevus flammeus)

Diagnosis

The diagnosis of Bonnet-Dechaume-Blanc Syndrome is typically established through a combination of ophthalmological and neurological evaluation:

Ophthalmoscopy (fundoscopy): Direct visualization of retinal vessels; arteriovenous malformations are often recognizable during a standard eye examination.
Fluorescein angiography: Imaging of the retinal vasculature using a contrast dye injected into the bloodstream.
Brain MRI (Magnetic Resonance Imaging): Detection of cerebral AVMs, hemorrhage, or structural brain changes.
Cerebral angiography: Detailed mapping of the brain vasculature, essential for surgical planning.
CT (Computed Tomography): Used to rule out acute intracranial bleeding.

Treatment

There is no curative treatment for Bonnet-Dechaume-Blanc Syndrome. Management is directed at controlling symptoms and preventing complications:

Treatment of Cerebral AVMs

Neurosurgical resection of accessible and operable AVMs
Stereotactic radiosurgery (Gamma Knife): Targeted irradiation to reduce or occlude the AVM
Endovascular embolization: Catheter-based occlusion of the abnormal vessels

Treatment of Retinal AVMs

Retinal AVMs are generally not actively treated, as laser or surgical interventions may further compromise vision.
Regular ophthalmological follow-up examinations are essential.

Symptomatic Therapy

Antiepileptic drugs for seizure management
Pain management for chronic headaches
Long-term neurological and ophthalmological monitoring

Prognosis

The prognosis of Bonnet-Dechaume-Blanc Syndrome depends greatly on the size and location of the arteriovenous malformations. Small, asymptomatic AVMs may remain stable for extended periods. The most significant risk is spontaneous intracranial hemorrhage due to rupture of a cerebral AVM, which can result in permanent neurological disability or death. Ongoing follow-up by an interdisciplinary team of neurologists, neurosurgeons, and ophthalmologists is essential for all affected individuals.

References

Wyburn-Mason R. - Arteriovenous aneurysm of midbrain and retina, facial naevi and mental changes. Brain, 1943; 66(3):163-203.
Bhatt AA, Bhatt S. - Wyburn-Mason Syndrome (Bonnet-Dechaume-Blanc Syndrome). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023.
Kliegman RM et al. - Nelson Textbook of Pediatrics, 21st Edition. Elsevier, 2020.

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