Neonatal hemifacial spasm and fourth ventricle mass

Area of Science:

• Neurology
• Pediatric Neurology
• Neuroscience

Background:

• Congenital hemifacial spasm is a rare neonatal condition.
• It presents as paroxysmal hemifacial contractions affecting muscles innervated by the seventh cranial nerve.

Observation:

• The condition is characterized by unilateral, involuntary, irregular tonic or clonic contractions.
• Associated symptoms may include eyelid blinking, breathing irregularities, hyperventilation, dystonic movements, and nystagmus.
• Video-electroencephalography (EEG) recordings, both interictal and ictal, did not reveal epileptiform abnormalities.

Findings:

• Brain magnetic resonance imaging (MRI) consistently revealed a mass involving the cerebellar peduncle, cerebellar hemisphere, or floor of the fourth ventricle.
• The semiology of paroxysmal attacks is likely due to hypersynchronous discharges within the lesion activating cranial nerve nuclei.
• Intraoperative recordings and functional brain imaging support this hypothesis.

Implications:

• Early identification of these seizures is vital for diagnosing the underlying cerebral lesion.
• Prompt diagnosis facilitates timely intervention and management of congenital hemifacial spasm.
• Understanding the neurophysiological basis aids in differentiating from other conditions and guides therapeutic strategies.