Fig 4. Intracochlear schwannoma with a 5-year MR FU showing growth into the vestibule and IAC. Axial Gd-enhanced T1-weighted images through the basal turn (BT) (A, D, G, and J), second turn (SecT), and apical turn (AT) (B, E, H, and K) and the upper part of the SecT and vestibule (C, F, I, and L). A–C, At presentation: enhancing schwannoma anteriorly in BT (white arrow) and SecT (white arrowhead). D–F, 3-years later, growth into posterior part of both BT (white arrow) and ST (white arrowheads) and into anteroinferior part of the vestibule (gray arrow). Subtle enhancement near the IAC fundus (black arrow) suspicious for extension into the IAC. G–I, After 4-years, enhancement at IAC fundus became nodular (black arrow), confirming growth into the IAC. Enhancement in AT (gray arrowhead) and the anteroinferior part (gray arrows) and also in the superior part of the vestibule (double gray arrowhead), indicating further growth. J–L, After 5 years, further growth with complete enhancement of AT (gray arrowheads), larger extension in IAC (black arrow), and involvement of posterior-inferior (gray arrows) and superior parts (double gray arrowheads) of the vestibule.