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  • Title: [Association of an arachnoid cyst with heterotopic neuroglial tissue in the internal auditory canal].
    Author: Aubry K, Wassef M, Guichard JP, Herman P, Tran Ba Huy P.
    Journal: Ann Otolaryngol Chir Cervicofac; 2009 Jun; 126(3):133-7. PubMed ID: 19457470.
    Abstract:
    OBJECTIVES: We report a case of an association of an arachnoid cyst with heterotopic neuroglial tissue in the internal auditory canal. MATERIAL AND METHODS: A 66-year-old woman consulted for cochleovestibular syndrome. RESULTS: MRI demonstrated a lesion with spontaneous hypersignal on T1- and T2-weighted images, instigating surgical exploration. We discovered a hematic arachnoid cyst associated with heterotopic neuroglial tissue arising in the internal auditory canal. CONCLUSION: An arachnoid cyst arising within the cerebellopontine angle or the internal auditory canal is a rare occurrence. Clinical manifestations are identical with those produced by a cochleovestibular schwannoma. MRI usually demonstrates a nonenhancing isointense cystic mass with cerebrospinal fluid on all sequences (hypointense on T1-weighted and hyperintense on T2-weighted images). These lesions are usually monitored. Spontaneous hypersignal on T1- and T2-weighted images makes diagnosis difficult, as in our case, leading to surgical exploration.
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