Trigeminal cystic schwannoma. An 84-year-old asymptomatic male in whom the lesion was discovered as an incidental finding. Fast imaging employing steady-state acquisition MRI sequence showing an extra-axial, predominantly cystic expansive mass along the cisternal segment of right cranial nerve V (arrows on the left), extending anteriorly to Meckel’s cave. The arrow on the right indicates the normal trigeminal nerve.