Spontaneous recanalization of an occluded middle cerebral artery in a patient with moyamoya.

Moyamoya disease is a rare cerebrovascular disorder that is characterized by progressive stenosis of the distal portion of the internal carotid artery and its main branches. Here the authors present the first case of spontaneous recanalization of an occluded middle cerebral artery in a woman with moyamoya who had not undergone surgical or endovascular treatment. Although the exact mechanisms remain unclear, spontaneous recanalization in moyamoya could be considered a possible phenomenon. Thus, the neurosurgeons should always pay attention to the pathological variety of dynamic changes in the cerebrovascular structure in moyamoya.