Fig. 19
From: Neuroimaging assessment in Down syndrome: a pictorial review
Cerebral angiography in a 46-year-old Down syndrome patient with moyamoya pattern. a Frontal view, right internal carotid artery injection, showing occlusion of the right anterior cerebral artery, with a network of collateral vessels (moyamoya vessels) in the supra-sellar cistern with reconstitution of the anterior cerebral artery arterial flow distally. b Lateral view, left internal carotid artery injection, showing severe narrowing of this artery, which ends on the cavernous segment, where the arterial flow diverges to a meningohypophyseal trunk with anastomosis with the ophthalmic artery and dural branches of the middle meningeal artery, forming a network of collateral capillaries, typical of moyamoya syndrome