Acoustic neuroma: Primary arising in the vestibule

Abstract

As more information on acoustic tumors is accumulated, it is apparent that the lesions may have several sites of origin. A case of an acoustic tumor arising primarily in the vestibule is presented. This case, which has been followed for seven years, supports the proposed theory that the tumor may develop from the nerves to either the saccule or the utricle.

Intralabyrinthine Schwannomas: Imaging Diagnosis and Classification

“…This tumor most commonly originates near the vestibular ganglion at the junction of the central and peripheral myelin near the fundus of the IAC at the Schwann cellϪglial junction but can be found anywhere along the nerve from the IAC to the terminal ends of the eighth cranial nerve within the vestibule, cochlea, or semicircular canals. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] ILSs are defined as tumors arising primarily from within the membranous labyrinth: cochlea, vestibule, or semicircular canals.…”

Imaging of Intralabyrinthine Schwannomas: A Retrospective Study of 52 Cases with Emphasis on Lesion Growth

“…2 During the 1970s, ILSs were found during labyrinthectomy performed for intractable vertigo or Menière disease. 3,4 Diagnosis of ILSs was difficult on CT, and only isolated cases were described. 5,6 With the advent of gadolinium (Gd)-enhanced MR imaging, an increasing number of ILSs were detected during screening for hearing loss and/or vertigo.…”

Intracochlea acoustic neuroma: a case report and discussion

“…There have also been reports of purely intralabyrinthine schwannomas arising from both cochlea or vestibular neural elements [4]. In the past these tumours were unsuspected findings during surgery for vertigo [2,6,7,8,14,16,17,18] or have been found incidentally in temporal bone collections [1,9,10,12,15]. A case was diagnosed radiologically prior to surgery in 1972 [11].…”