Navigating Neurological and Orthopedic Complications

As your child grows, Christianson Syndrome (CS) presents unique challenges that require careful monitoring. Because CS is a progressive condition, symptoms can change over time ^[1]. Staying ahead of these changes—specifically in the brain and the spine—is the best way to ensure your child stays safe and comfortable.

Managing Complex Seizures and ESES

Most children with CS develop epilepsy within the first two years of life ^[2]. These seizures are often intractable, meaning they are difficult to control with standard anti-seizure medications ^[3][4].

A specific type of seizure activity called ESES (Electrical Status Epilepticus during Sleep) is common in CS, often appearing between ages 4 and 8 ^[2][5].

• What is it? ESES is “silent” seizure activity that happens almost continuously while the child is asleep ^[6]. You likely won’t see any shaking or physical movements.
• Why it matters: This constant electrical storm during sleep can prevent the brain from resting and processing information, which may lead to developmental regression—the loss of skills your child once had ^[4][5].
• What to do: Doctors use a “sleep EEG” to diagnose ESES. It is important to monitor your child’s sleep brain activity, especially if you notice they are losing skills or seem more confused than usual ^[2].

Understanding Cerebellar Degeneration

The cerebellum is the part of the brain responsible for balance, coordination, and fine motor skills. In CS, this area undergoes cerebellar degeneration (also called atrophy), meaning it slowly shrinks over time ^[1][7].

• How it looks: This typically presents as ataxia, a shaky or uncoordinated way of moving ^[1]. As the degeneration progresses, a child who was able to walk may begin to fall more often or eventually require a wheelchair ^[1][8].
• The Trend: While the intellectual disability is present from birth, the motor difficulties often worsen into adulthood ^[1][9]. Regular neurological exams can help track these changes and adjust physical therapy needs ^[1].

A Critical Safety Risk: Atlantoaxial Instability (AAI)

A serious, though less common, orthopedic risk to watch for in CS is atlantoaxial instability (AAI). This occurs when the first two bones in the neck are too loose or unstable ^[10].

• The Cause: This instability is often related to os odontoideum, a condition where a small bone in the upper neck doesn’t fuse properly to the spine ^[10].
• The Risk: If these bones slip, they can press on the spinal cord, leading to myelopathy—a term for injury or compression of the spinal cord ^[10]. This is a medical emergency that can lead to permanent paralysis if not treated.
• Warning Signs: Because children with CS have a high pain tolerance, they may not tell you their neck hurts. You must watch for:
  • Sudden or gradual increased muscle weakness in the arms or legs ^[10].
  • Changes in how they walk (gait) that seem different from their usual ataxia ^[10].
  • Increased spasticity, sudden loss of previously mastered motor skills, or unexplained changes in muscle tone ^[10].

Caregivers should discuss baseline neck X-rays with their medical team to screen for AAI and ensure the child’s spine is stable during activities or surgeries ^[10].