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Case Reports
. 2005 Jun-Jul;26(6):1328-30.

Intraparotid facial nerve schwannoma: a report of five cases and an analysis of MR imaging results

Ken Shimizu  1 , Hiroshi Iwai, Koshi Ikeda, Noriko Sakaida, Satoshi Sawada
Affiliations
Case Reports

Intraparotid facial nerve schwannoma: a report of five cases and an analysis of MR imaging results

Ken Shimizu et al. AJNR Am J Neuroradiol. 2005 Jun-Jul.

Abstract

We present five cases of intraparotid facial nerve schwannoma. In four of the five cases, tumors arising from the main facial nerve trunk were centered just below the skull base near the stylomastoid foramen and had a small cranial extension into the lower facial nerve canal. In three cases, each tumor had higher signal intensity around the periphery on T2-weighted images (target sign). These findings may be highly suggestive of an intraparotid facial nerve schwannoma.

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Figures

F<sc>ig</sc> 1.
Fig 1.
Case 1. A, Axial T1-weighted image (spin-echo: TR/TE, 650/10.7) shows a low-signal-intensity well-defined mass in the right parotid gland. B, Axial T2-weighted image (fast spin-echo: TR/TE, 3150/108) shows peripheral high signal intensity surrounding a central region of lower signal intensity.
F<sc>ig</sc> 2.
Fig 2.
Case 2. A, Axial T1-weighted image (spin-echo: TR/TE, 650/9.3) shows a lobulated mass in the right parotid gland, with a low-signal-intensity well-defined mass in the right parotid gland. B, Axial T2-weighted image (fast spin-echo: TR/TE, 3150/108) shows a heterogeneous hyperintense mass. C, Axial gadolinium-enhanced T1-weighted image (spin echo; TR/TE, 650/9.3) shows a mass in the right parotid gland with heterogeneous enhancement. D, Coronal STIR image (TR/TE/TI, 3216/36/165) shows a hyperintense mass in the right parotid gland. The tumor is situated directly caudal to the stylomastoid foramen and protrudes into it (arrow).
See this image and copyright information in PMC

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