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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 22:880-884 (5 2001)
© 2001 American Society of Neuroradiology

ARTICLE

MR Imaging in Two Cases of Subacute Denervation Change in the Muscles of Facial Expression

Nancy J. Fischbein^,a, Michael J. Kaplan^a, Robert K. Jackler^a and William P. Dillon^a

^a From the Departments of Radiology (N.F., W.D.) and Otolaryngology-Head and Neck Surgery (M.K., R.J.) University of California, San Francisco, San Francisco, CA.

Summary: Denervation changes in muscle following damage to cranial and peripheral nerves can be observed on both CT and MR imaging studies. These findings are well described for cranial nerves (CN) V, X, XI, and XII. The CT findings of denervation atrophy due to CN VII dysfunction have been reported. We describe the MR imaging findings in two patients with perineural spread of tumor along CN VII. Both patients showed T2 prolongation and postcontrast enhancement in muscles of facial expression, suggestive of subacute denervation changes.

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