Let’s Learn about CANVAS, a Rare Neurologic Disorder, (plus, clinical care and research & treatments)

CANVAS stands for Cerebellar Ataxia, Neuropathy, and Vestibular Areflexia Syndrome

It is a rare, slowly progressive genetic neurological disorder that typically starts in adults over the age of 50. It causes a “triple-hit” to the body’s balance and sensory systems, leading to chronic unsteadiness, sensory loss, and vision-blurring reflex issues.

CANVAS is caused by a genetic mutation that is passed on from parents to their children. CANVAS leads to problems with balance and coordination, issues with sensory nerves, and loss of reflexes related to balance.

Key Symptoms

• Cerebellar Ataxia (CA): Poor muscle coordination, wide-based unsteady walking, stumbling, and sometimes slurred speech or difficulty swallowing. [1, 2, 3]
• Neuropathy (N): Damage to sensory nerves causing numbness, tingling, pain, or a reduced ability to feel vibration and position (proprioception). [1, 2, 3]
• Vestibular Areflexia (VA): Loss of inner-ear balance reflexes, leading to oscillopsia (bouncy or blurry vision when moving the head). [1, 2, 3, 4]
• Early Sign: An unexplained, long-standing chronic dry cough often precedes balance problems by years or even decades.

Causes and Diagnosis

• Genetics: It is an autosomal recessive condition linked to a repeat expansion in the RFC1 gene.
• Testing: Diagnosis is confirmed via targeted genetic testing for the RFC1 mutation, supported by nerve conduction studies, vestibular testing, and brain MRIs showing cerebellar shrinkage. [1, 2, 3, 4, 5, 6, 7]

Management and Treatment

• There is no cure, so treatment focuses on supportive care.
• Vestibular rehabilitation (specialized physical therapy) helps the brain compensate for lost inner-ear and balance signals.
• Fall-prevention strategies and mobility aids are routinely used as the condition progresses. [1, 2, 3, 4, 5]

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Source: National Ataxia Foundation

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