FIG 2. A 52-year-old woman (patient 2) with several previous episodes of visual disturbance.

A and B, Visual field examination (A) and T2-weighted image [4500/120 (TR/TE)] (B) are normal.

C, MR angiogram [30/6.4/25° (TR/TE/flip angle)] shows poor blood flow (arrowheads) in the right posterior cerebral artery.

D, fMR [90/56/40° (TR/TE/flip angle)] shows decreased activity in the right visual cortex.