Cellosaurus Disease Terminology Non-Neoplastic Vascular Disorder Rare Non-Neoplastic Disorder Moyamoya Disease Moyamoya Disease A rare inherited vascular disorder characterized by constriction of arteries at the base of the brain, resulting in the formation of collateral circulation in order to compensate for the constriction. The name "moyamoya" in Japanese means "puff of smoke" and derives from the characteristic radiographic appearance of the collateral vessels. Moyamoya Disease Cellosaurus Disease or Syndrome C0026654 C84895