Pendular nystagmus in hypomyelinating leukodystrophy

Area of Science:

• Neurology
• Neuroscience
• Radiology

Background:

• Hypomyelinating leukodystrophies are a group of rare genetic disorders characterized by impaired myelin formation in the central nervous system.
• These conditions can present with a variety of neurological symptoms, often including motor and visual deficits.

Observation:

• A 49-year-old woman with hypomyelinating leukodystrophy presented with characteristic pendular nystagmus and upper limb ataxia.
• Pendular nystagmus, a type of involuntary eye movement, was analyzed using video-oculography.
• Ataxia was assessed using the index-to-nose test, with slow-motion video employed to better visualize the movements.

Findings:

• Brain magnetic resonance imaging (MRI) revealed a distinct pattern consistent with hypomyelination.
• The combination of pendular nystagmus and ataxia was observed in the patient.
• Video-oculography provided detailed analysis of the nystagmus, aiding in its characterization.

Implications:

• Pendular nystagmus is identified as a crucial clinical indicator for diagnosing central nervous system (CNS) hypomyelination.
• The findings emphasize the importance of integrating clinical neurological examination with neuroimaging for accurate diagnosis of leukodystrophies.
• This case contributes to the understanding of the clinical manifestations and diagnostic markers of hypomyelinating disorders.