Intraparotid Facial Nerve Schwannoma: A Report of Five Cases and an Analysis of MR Imaging Results
Ken Shimizua,d,
Hiroshi Iwaib,
Koshi Ikedaa,
Noriko Sakaidac and
Satoshi Sawadaa
a Department of Radiology, Kansai Medical University, Moriguchi, Osaka, Japan
b Department of Otolaryngology, Kansai Medical University, Moriguchi, Osaka, Japan
c Department of Pathology, Kansai Medical University, Moriguchi, Osaka, Japan
d Department of Radiology, Osaka Red Cross Hospital, Tennouji, Osaka, Japan
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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.
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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).
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