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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 26:1328-1330, June-July 2005
© 2005 American Society of Neuroradiology

HEAD AND NECK

Intraparotid Facial Nerve Schwannoma: A Report of Five Cases and an Analysis of MR Imaging Results

Ken Shimizu^a,d, Hiroshi Iwai^b, Koshi Ikeda^a, Noriko Sakaida^c and Satoshi Sawada^a

^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

Address reprint requests to Koshi Ikeda, MD, Department of Radiology, Kansai Medical University, 10-15, Fumisono, Moriguchi, Osaka 570-8507, Japan

Summary: 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.