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  • Title: Collision tumor of the facial nerve: a synchronous seventh nerve schwannoma and neurofibroma.
    Author: Gross BC, Carlson ML, Driscoll CL, Moore EJ.
    Journal: Otol Neurotol; 2012 Oct; 33(8):1426-9. PubMed ID: 22975907.
    Abstract:
    OBJECTIVE: To report a novel case of a collision tumor involving an intraparotid neurofibroma and a mastoid segment facial nerve schwannoma. STUDY DESIGN: Clinical capsule report. SETTING: Tertiary academic referral center. PATIENT: A 29-year-old woman with a 2-year history of an asymptomatic enlarging left infraauricular mass and normal FN function presented to a tertiary care referral center. Computed tomography and magnetic resonance imaging demonstrated a cystic lesion in the deep portion of the parotid gland extending into the stylomastoid foramen. INTERVENTION: The patient underwent superficial parotidectomy, and a cystic parotid mass was found to be intrinsic to the intraparotid facial nerve. A portion of the mass was biopsied, and intraoperative frozen section pathology was consistent with a neurofibroma. A mastoidectomy with FN decompression was then performed until a normal-appearing segment was identified just proximal to the second genu. After biopsy, proximal facial nerve stimulation failed to elicit evoked motor potentials, and en bloc resection was performed. RESULTS: Final pathology demonstrated a schwannoma involving the mastoid segment and a neurofibroma involving the proximal intraparotid facial nerve. CONCLUSION: We report the first case of a facial nerve collision tumor involving an intraparotid neurofibroma and a mastoid segment facial nerve schwannoma. Benign FN sheath tumors of the parotid gland are rare but should be considered in the differential diagnosis of a parotid mass.
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