Symptoms

Symptoms of Moyamoya Disease

Moyamoya disease is a rare cerebrovascular disorder that affects children and adults. In children, the first symptom is most often a stroke or recurrent transient ischemic attacks (TIA). In adults with moyamoya, hemorrhagic stroke is the most likely to occur. This results from recurring blood clots in the affected blood vessels.

Symptoms of moyamoya disease may include:

  • Disturbed consciousness
  • Aphasia or other speech disorders
  • Sensory impairment
  • Cognitive impairment
  • Vision problems
  • Involuntary movement

Moyamoya disease is a progressive condition. Without surgical treatment, people with moyamoya will have multiple strokes and continuing mental decline because of the narrowing of the arteries in their brains.

Because moyamoya tends to run in families, researchers think it may be caused by an inherited genetic condition. Ongoing research is dedicated to finding any abnormal gene(s) that may cause moyamoya.