Progressive chorea and dystonia associated with a large arteriovenous malformation
A nine-year-old male with intellectual disability and epilepsy presented with a progressive movement disorder characterised by chorea and dystonia primarily affecting the left face, arm, and leg. Neuroimaging revealed a diffuse Spetzler-Martin Grade IV arteriovenous malformation centered within the right thalamus with bilateral extension into the basal ganglia, midbrain and pons. An associated network of developmental venous anomalies was noted to coalesce into ectatic deep drainage, causing obstructive hydrocephalus (Figure 1). Surgical management was not indicated given the anatomy and location of the lesion.
The patient presented with a stepwise clinical decline over several months, with worsening chorea and dystonia resulting in loss of function of the left arm, severe left arm pain, and loss of the ability to ambulate independently (Video 1). The involuntary movements and arm pain improved following treatment with clonazepam, baclofen, tetrabenazine, and hydrocodone/acetaminophen as well as chemodenervation with intramuscular botulinum toxin. The patient developed somnolence in the setting of worsening hydrocephalus. Following the ventriculoperitoneal shunt, he experienced a dramatic improvement in his level of awareness, without further improvement in his involuntary movements.
The pathogenesis of secondary movement disorders is varied; etiologies include hypoxia, stroke, and kernicterus . Movement disorders resulting from congenital vascular malformations are relatively uncommon and can be difficult to treat. Apart from producing structural abnormalities, which can physically disrupt normal basal ganglia-thalamocortical circuits, vascular malformations can further complicate regional dysfunction by vascular steal phenomena . In this case, surgical and medical management has been helpful. Intrathecal baclofen therapy may be an option in the future should symptoms become refractory to medical interventions.
Appropriate consent was obtained from the family for video use within this publication.
Video 1: Patient video demonstrating left hemidystonia, chorea of the left arm, and gait impairment. http://icnapedia.org/s/148
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