Fig 3. Intravestibular schwannoma growing inside the right vestibular system and into the basal turn (BT). Axial DRIVE images through the midcochlea (A and C) and upper part of the SecT (B and D) and axial DRIVE image through the BT. A and B, Intravestibular schwannoma inside the anterior vestibule (white arrows) and ampulla of the lateral SCC (white arrowhead). C and D, 2 years later, schwannoma extended more posteriorly in the vestibule (white arrows) and occupied a larger part of the ampulla of the lateral SCC (white arrowheads). E, The schwannoma also grew back into the cochlea. Because of the open anatomic connection between the saccular perilymphatic space and perilymph inside the SV, the schwannoma will first grow into the SV of the posterior BT (double white arrowhead). Normal signal intensity still present in anterior part of SV (white arrowhead) and entire ST (white arrows).