Fig. 2
From: Diagnosing moyamoya syndrome using ultrasound - a case report
Cerebral digital subtraction angiography left (a) in frontal projection. Severe stenosis of the carotid artery (black arrow); the middle cerebral artery is obliterated (red arrows). Branches of the collateral network with leptomeningeal anastomoses are indicated by white arrows. Image b demonstrates a leptomeningeal collateral branch in the duplex-sonography. The digital subtraction angiography right (c) indicates collateral vessels (white arrows) by obliterated middle and anterior cerebral artery; correspondently the transcranial duplex-sonography right (d) demonstrates numerous arterial vessels assembling the collateral network