Schwannoma arising from the tentorium at an unusual location: case report

We present a case of schwannoma attached to the tentorium. A 41-year-old woman without evidence of neurofibromatosis presented with a 3-month history of headache, positional vertigo, and truncal ataxia. Magnetic resonance imaging revealed an extra-axial cystic mass lesion in the left anteromedial ce...

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Veröffentlicht in:Neurosurgery 2002-06, Vol.50 (6), p.1352-1355
Hauptverfasser: Oikawa, Akihiro, Takeda, Naoto, Aoki, Nobuhiko, Takizawa, Touichiro, Sakoma, Takaaki
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container_end_page 1355
container_issue 6
container_start_page 1352
container_title Neurosurgery
container_volume 50
creator Oikawa, Akihiro
Takeda, Naoto
Aoki, Nobuhiko
Takizawa, Touichiro
Sakoma, Takaaki
description We present a case of schwannoma attached to the tentorium. A 41-year-old woman without evidence of neurofibromatosis presented with a 3-month history of headache, positional vertigo, and truncal ataxia. Magnetic resonance imaging revealed an extra-axial cystic mass lesion in the left anteromedial cerebellar region with a dural tail sign. The tumor was removed completely by retrosigmoid craniotomy. Dense adhesion of the tumor to the inferior surface of the tentorium was confirmed during surgery. On light microscopic study, this neoplasm was composed of spindle cells and showed palisaded structures. Immunohistochemically, the tumor cells stained positive for S-100 protein and vimentin. Reticulin staining revealed a pericellular pattern of distribution of reticulin fibers. Electron microscopy confirmed the presence of a basement membrane encompassing the tumor cells. From these findings, the tumor was diagnosed as a schwannoma arising from the tentorium. To our knowledge, this case report is the first to describe a schwannoma arising from the tentorium. Our case report indicates that schwannoma is a possible pathology in the differential diagnosis of dura-based tumors.
doi_str_mv 10.1097/00006123-200206000-00028
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A 41-year-old woman without evidence of neurofibromatosis presented with a 3-month history of headache, positional vertigo, and truncal ataxia. Magnetic resonance imaging revealed an extra-axial cystic mass lesion in the left anteromedial cerebellar region with a dural tail sign. The tumor was removed completely by retrosigmoid craniotomy. Dense adhesion of the tumor to the inferior surface of the tentorium was confirmed during surgery. On light microscopic study, this neoplasm was composed of spindle cells and showed palisaded structures. Immunohistochemically, the tumor cells stained positive for S-100 protein and vimentin. Reticulin staining revealed a pericellular pattern of distribution of reticulin fibers. Electron microscopy confirmed the presence of a basement membrane encompassing the tumor cells. From these findings, the tumor was diagnosed as a schwannoma arising from the tentorium. 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subjects Adult
Cerebellar Neoplasms - diagnosis
Cerebellar Neoplasms - metabolism
Cerebellar Neoplasms - pathology
Cerebellar Neoplasms - surgery
Craniotomy
Diagnosis, Differential
Female
Humans
Immunohistochemistry
Magnetic Resonance Imaging
Microscopy, Electron
Neurilemmoma - diagnosis
Neurilemmoma - metabolism
Neurilemmoma - pathology
Neurilemmoma - surgery
Reticulin - metabolism
S100 Proteins - metabolism
Vimentin - metabolism
title Schwannoma arising from the tentorium at an unusual location: case report
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