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Case Reports
. 2003 Sep;24(8):1642-5.

Intralabyrinthine meningioma

Todd R Aho  1 , C Phillip Daspit, Bruce L Dean, Robert C Wallace
Affiliations
Case Reports

Intralabyrinthine meningioma

Todd R Aho et al. AJNR Am J Neuroradiol. 2003 Sep.

Abstract

An 18-year-old female patient with unilateral hearing loss underwent evaluation with CT and MR imaging. A partially ossified, enhancing lesion in the bony labyrinth, with replacement of adjacent structures, was identified. Surgical biopsy revealed a meningioma arising primarily within the bony labyrinth. To our knowledge, this entity has not been previously described.

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Figures

F<sc>ig</sc> 1.
Fig 1.
Dedicated thin-section, axial, T1-weighted (750/14/2/256 × 192/18 cm/2.5 mm/0.4 mm [TR/TE/NEX/matrix/FOV/section thickness/skip]) gadolinium-enhanced MR images show enhancement of the left labyrinthine lesion with minimal enhancement in the adjacent IAC.
F<sc>ig</sc> 2.
Fig 2.
Dedicated thin-section axial (A) (750/14/2/256 × 192/18 cm/2.5 mm/0.4 mm [TR/TE/NEX/matrix/FOV/section thickness/skip]) and coronal (B) (600/14/2/256 × 192/18 cm/2.5 mm/0.4 mm) T1-weighted MR images obtained before gadolinium enhancement and axial fast spin-echo T2-weighted image (C) (5050/84/3/320 × 256/24 cm/5 mm/2.5 mm) demonstrate the labyrinthine mass, which is isointense to hypointense on both T1- and T2-weighted images.
F<sc>ig</sc> 3.
Fig 3.
Direct axial (A–C) and coronal (D–F) 1-mm CT images of the left temporal bone obtained by using a bone algorithm. A partially ossified lesion, centered within the bony labyrinth, replaces the normal modiolus, vestibule, and basal turn of the cochlea. (1-mm section thickness, 512 × 512 matrix, 9.6-cm field of view, 9.6 cm/kV, 120/mAc 300).
See this image and copyright information in PMC

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