AJDRAJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 2009;30:1451.

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American Journal of Neuroradiology
DOI 10.3174/ajnr.A1511

HEAD & NECK

Fluid-Fluid Level Formation: A Rare Finding of Extracranial Head and Neck Schwannomas

H. Kato, M. Kanematsu, K. Mizuta, M. Aoki, K. Yamada, H. Yamakawa, T. Iwama and Y. Hirose

From the Departments of Radiology (H.K., M.K.), Otolaryngology (K.M., M.A.), Neurosurgery (K.Y., H.Y., T.I.), and Pathology (Y.H.), and High-Level Imaging Diagnosis Center (M.K.), Gifu University School of Medicine, Gifu, Japan.

Please address correspondence to Hiroki Kato, MD, Department of Radiology, Gifu University School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan; e-mail: hkato{at}gifu-u.ac.jp

SUMMARY: We present 3 cases of extracranial head and neck schwannomas exhibiting fluid-fluid levels. In the described cases, CT and MR imaging showed predominantly cystic components, intermixed with cellular components. Histopathologic examinations of excised specimens revealed hemosiderin deposition, reflecting intratumoral hemorrhages, which was presumably a cause of fluid-fluid levels. Although fluid-fluid levels are nonspecific findings, schwannoma should be considered when radiologic images demonstrate marked cystic formation with fluid-fluid levels in extracranial head and neck tumors.




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