Abstract
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.
Highlights
The head and neck region is favored, and approximately 25% to 45% of benign schwannomas arise in this area.[1]
Head and neck schwannomas usually occur in the intracranial region and rarely occur extracranially
Cystic formations are often observed in intracranial and extracranial schwannomas, multicystic formations and intratumoral hemorrhage in schwannomas are relatively rare
Summary
Fluid-Fluid Level Formation: A Rare Finding of Extracranial Head and Neck Schwannomas. SUMMARY: We present 3 cases of extracranial head and neck schwannomas exhibiting fluid-fluid levels. 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. The head and neck region is favored, and approximately 25% to 45% of benign schwannomas arise in this area.[1] head and neck schwannomas usually occur in the intracranial region and rarely occur extracranially. Cystic formations are often observed in intracranial and extracranial schwannomas, multicystic formations and intratumoral hemorrhage in schwannomas are relatively rare. We describe the CT and MR imaging findings of 3 patients with extracranial head and neck schwannomas that exhibited fluid-fluid levels, which presumably reflected intratumoral hemorrhage
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