Moyamoya phenomenon

Case contributed by Townsville radiology training

Patient Data

Age: 11 years
Gender: Male

Multiple stenotic regions in the anterior circulation, mainly central vessels (M1, A1 segments).

Enlarged perforator branches from left MCA giving rise to small corkscrew parenchymal vessels. This appearance of puff of smoke classical of moyamoya phenomenon.

Enlarged pericallosal and anterior choroidal arteries, again with collaterals.

Vertebrobasilar circulation (not shown) is not stenotic and is supplying collaterals to the anterior circulation, well rostral to the occipitoparietal sulcus. Similarly, the external carotid artery is fully patent and contributing to the anterior circulation.

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Case information

rID: 19457
Published: 12th Sep 2012
Last edited: 19th Sep 2019
Inclusion in quiz mode: Included

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