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PT  - JOURNAL ARTICLE
AU  - Kato, H.
AU  - Kanematsu, M.
AU  - Mizuta, K.
AU  - Aoki, M.
AU  - Yamada, K.
AU  - Yamakawa, H.
AU  - Iwama, T.
AU  - Hirose, Y.
TI  - Fluid-Fluid Level Formation: A Rare Finding of Extracranial Head and Neck Schwannomas
AID  - 10.3174/ajnr.A1511
DP  - 2009 Aug 01
TA  - American Journal of Neuroradiology
PG  - 1451--1453
VI  - 30
IP  - 7
4099  - http://www.ajnr.org/content/30/7/1451.short
4100  - http://www.ajnr.org/content/30/7/1451.full
SO  - Am. J. Neuroradiol.2009 Aug 01; 30
AB  - 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.