Meningiomas of the Internal Auditory Canal: Two Case Reports

Giuseppe Magliulo; Francesco Zardo; Serena Bertin; Raffaello D'Amico; Vincenzo Savastano

doi:10.1055/s-2002-21569

Skull Base, Table of Contents

Skull Base 2002; 12(1): 019-026
DOI: 10.1055/s-2002-21569

CASE REPORT

Meningiomas of the Internal Auditory Canal: Two Case Reports

Giuseppe Magliulo, Francesco Zardo, Serena Bertin, Raffaello D'Amico, Vincenzo Savastano

2nd ENT Department, University ``La Sapienza,'' Policlinico Umberto I, Rome, Italy

Abstract

ABSTRACT

Meningiomas represent 3 to 12% of the tumors that involve the cerebellopontine angle and internal auditory canal (IAC). Intracanalicular meningiomas, however, are rare. Only 10 well-documented cases have been reported in the English literature. The differential diagnosis includes acoustic neuromas, facial nerve neuromas, hemangiomas, lipomas, and meningiomas. We report two new cases of intracanalicular meningioma. Both patients had unilateral tinnitus. In case 1, the patient also experienced sensorineural hearing loss with unilateral tinnitus. In case 1, the lesion appeared hyperintense on T1-weighted and hypointense on T2-weighted magnetic resonance images. In case 2, the patient had an enhancing lesion in the right IAC. The tumors were moderately cellular, and meningeal whorls and meningothelial inclusions were present. Immunohistochemical staining revealed the tumors to be positive for epithelial membrane antigen (EMA) and negative for S-100 protein. The radiologic findings that help distinguish a meningioma from other lesions are reviewed.

KEYWORD

Meningioma - internal auditory canal - acoustic neuroma

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