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Schwannoma in the sublingual space

¹ Department of Radiology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan; ² Aizawa Hospital PET Center, 2-5-1 Honjou, Matsumoto 390-8510, Japan; ³ Department of Dentistry & Oral Surgery, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan

*Correspondence to: Rei Kawakami, Department of Radiology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621 Japan; Email: kawakami{at}hsp.md.shinshu-u.ac.jp

Received 4 November 2003; revised 1 June 2004; accepted 1 June 2004

In this report, we present CT and MRI findings of a case of a schwannoma that developed in the floor of the oral cavity. A 49-year-old woman visited our hospital with a painless swelling in the oral floor. CT and MRI revealed a well circumscribed oval mass in the sublingual space, which showed cystic degeneration in most of the lesion. In addition, a thickened wall that strongly enhanced after injection of contrast medium and formation of fluid level were observed in the mass. The mass was removed and was histopathologically diagnosed as schwannoma. Only a few cases of schwannoma in the oral floor have been reported. However, when the characteristic findings are observed on CT and MRI, schwannoma should be added to the differential diagnosis.

Keywords: Schwannoma; CT; MRI; sublingual space

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