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Downgaze paresis following severe head trauma in a child
1Department of Ophthalmology, Royal Liverpool Children's NHS Trust, Royal Liverpool Children's Hospital, Alder Hey, UK.
Insights
Severe head trauma caused downgaze paresis in a child due to rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF) lesions. The condition persisted, with new convergence retraction nystagmus developing later.
Area of Science:
- Neuroscience
- Ophthalmology
- Pediatric Neurology
Background:
- Head trauma can cause significant neurological deficits.
- Ocular motor disorders following brain injury require detailed investigation.
Observation:
- A pediatric patient presented with downgaze paresis after severe head trauma.
- MRI revealed peri-aqueductal lesions in the midbrain, specifically the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF).
Findings:
- The downgaze paresis persisted at 25 weeks post-injury.
- Convergence retraction nystagmus developed during attempted upgaze, without changes in the midbrain lesions.
- This suggests the riMLF's role in downgaze control.
Implications:
- The findings support the riMLF's critical role in downgaze.
- A potential synkinesis is proposed to explain the development of convergence retraction nystagmus.
- Understanding these mechanisms aids in managing post-traumatic eye movement disorders.
Abstract:
A 4 1/2-year-old girl developed a downgaze paresis following severe head trauma. Magnetic resonance imaging showed evidence of peri-aqueductal lesions in the rostral midbrain in the region of the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF). Twenty five weeks following the injury, the downgaze paresis remained unchanged but she developed convergence retraction nystagmus on attempted upgaze. Repeat imaging did not show any change in the lesions in the rostral midbrain. This report provides further evidence for the riMLF in the control of downgaze, and a synkinesis is postulated for the development of the convergence retraction nystagmus.