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British Journal of Radiology (2008) 81, e84-e87
© 2008 British Institute of Radiology
doi: 10.1259/bjr/43860468
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Case report

A case of masticatory disturbance incidental to trigeminal schwannoma: changes in occlusal force and masticatory sensation before and after radiosurgery

M IIKUBO, DDS, PhD1, M SAKAMOTO, DDS, PhD1, T FURUUCHI, DDS, PhD1, M FUJIMURA, MD, PhD2, T TOMINAGA, MD, PhD2, S TAKAHASHI, MD, PhD2, I KOJIMA, DDS, PhD3 and T SASANO, DDS, PhD1

1 Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980- 8575 and Departments of 2 Neurosurgery and 3 Diagnostic Radiology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan

Correspondence: Masahiro Iikubo, Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan. E-mail: machapy{at}mail.tains.tohoku.ac.jp

We report here a case of masticatory disturbance evoked by trigeminal schwannoma, in which we have evaluated the changes in occlusal force and masticatory sensation before and after treatment for the tumour. The patient was a 43-year-old woman and her chief complaint was a loss of masticatory sensation on her left side. MR imaging revealed an enhanced tumour in the left cavernous sinus/Meckel's cave. The left masseter muscle function and occlusal force showed remarkable decreases before treatment; however, the sensory thresholds of her facial skin and dental pulp were not significantly different from the control side, indicating that her loss of masticatory sensation was not due to sensory disturbance but to occlusal force weakness. Gamma-knife radiosurgery resulted in a significant improvement in masticatory sensation following an increase in occlusal force.






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