Fig 4. A 60-year-old female patient with left side weakness (enrollment number 43 in Table 4).

A, 3D TOF-MRA shows a flow void (white arrow) in the proximal portion of left MCA with visible distal branches.

B, DSA oblique view reveals a focal low-degree stenosis at the corresponding location (black arrow, measured as 40%).

C, Retrospective review of the axial source images also shows a high-grade stenosis at the corresponding location. This type of overestimation may be caused by the turbulent flow and intravoxel phase dispersion within the proximal MCA stenosis close to the distal ICA bifurcation. This patient had a near occlusion of the right MCA that was responsible for her symptoms (not presented).