Healthy (left) and cancer-associated (right) posterior cerebral artery segmented from time-of-flight, unenhanced brain MRA (MOTSA technique, 5 slabs, TR/TE 35msec/3msec, 0.5 × 0.5 × 0.8 mm3, 352 × 448 × 192 voxels). Note the “many smaller bends upon each larger bend” that characterize cancer-associated vessel morphology. The closest lesion detectable on gadolinium-enhanced MR was over a centimeter away.