58 year-old man referred for SNHL and vertigo 2 days after stapedectomy with a reparative intravestibular granuloma, confirmed by surgery.
A, Coronal CT scan of the left temporal bone shows a soft tissue mass filling the oval window niche (arrow) and surrounding the tympanic portion of the facial nerve and the prosthesis.
B, Noncontrast T1-weighted MR image (500/15) reveals slight high signal intensity of the vestibule (arrow).
C, Axial contrast-enhanced T1-weighted MR image shows an enhancing mass of the oval window niche (arrowhead) spreading within the vestibule (single arrow) and the posterior (double arrows) and lateral (triple arrows) semicircular canals.