Fig. 4.

A. MRA of the head which shows severe narrowing with near occlusion of the bilateral distal supraclinoid internal carotid arteries (yellow arrows). There is reconstitution noted at the carotid terminus bilaterally. B. There are additionally prominent collateral vessels arising from the bilateral M1, A1 and posterior communicating arteries. These findings are keeping with Moyamoya disease. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)