FIG 1. A 55-year-old man (patient 1) with a visual field defect.

A, Visual field examination shows right homonymous inferior quadrantanopsia.

B, T2-weighted image [4500/120 (TR/TE)] shows infarction in the left occipital lobe (arrow). The left primary visual cortex itself and the visual pathway are spared.

C, Digital subtraction angiogram shows focal stenosis at the left posterior cerebral artery (arrows).

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