How is moyamoya disease diagnosed?

Updated: Nov 09, 2018
  • Author: Roy Sucholeiki, MD; Chief Editor: Amy Kao, MD  more...
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Cerebral angiography is the criterion standard for the diagnosis of moyamoya disease. The following findings support the diagnosis:

  • Stenosis or occlusion at the terminal portion of the internal carotid artery or the proximal portion of the anterior or middle cerebral arteries

  • Abnormal vascular networks in the vicinity of the occlusive or stenotic areas

  • Bilaterality of the described findings (although some patients may present with unilateral involvement and then progress)

Magnetic resonance angiography (MRA) or computed tomography angiography (CTA) can be performed. Any of the above findings on MRA or CTA may preclude the need for conventional angiography.

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