J Korean Soc Radiol.  2013 Apr;68(4):281-284. 10.3348/jksr.2013.68.4.281.

The CT and Magnetic Resonance Imaging Features of Transotic Schwannoma: A Case Report

Affiliations
  • 1Department of Radiology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea. sklee@dsmc.or.kr
  • 2Department of Pathology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.

Abstract

Transotic schwannoma is a condition extremely rare, and we herein report the CT, MRI, and pathologic findings of a transotic schwannoma case in a 38-year-old woman. The lesion was identified as an expansile mass in the internal auditory canal (IAC) and a mass in the middle ear cavity (MEC) on the high-resolution, bone algorithm, temporal bone CT. It was shown as the following: the hypointense masses of the cerebellopontine angle (CPA)-IAC and MEC, and the hypointense replacement of the normal high-signal intensity fluid of the cochlea, vestibule, and semicircular canals on the 3-dimensional (3D) fast imaging, employing the steady-state acquisition (FIESTA) sequence; and the intensely enhancing masses of the CPA-IAC and MEC, and the intense enhancement of the cochlea, vestibule, and semicircular canals on the 3D gadolinium-enhanced spoiled gradient-recalled echo (SPGR) sequence. The mass was removed via a transotic approach. The pathologic findings were consistent with schwannoma. The assessment of the extent of transotic schwannoma may be enhanced by the 3D FIESTA and the gadolinium-enhanced SPGR sequences.


MeSH Terms

Cerebellopontine Angle
Cochlea
Ear, Middle
Female
Humans
Magnetic Resonance Imaging
Magnetic Resonance Spectroscopy
Magnetics
Magnets
Neurilemmoma
Semicircular Canals
Temporal Bone
Tomography, X-Ray Computed
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