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. 2014:2014:371969.
doi: 10.1155/2014/371969. Epub 2014 Jun 26.

Cystic meningioma simulating arachnoid cyst: report of an unusual case

Jorge Docampo, Nadia Gonzalez, Claudio Vazquez, Carlos Morales, Eduardo Gonzalez-Toledo  1
Affiliations

Cystic meningioma simulating arachnoid cyst: report of an unusual case

Jorge Docampo et al. Case Rep Radiol. 2014.

Erratum in

  • Case Rep Radiol. 2014;2014:293805. Jorge, Docampo [corrected to Docampo, Jorge]; Nadia, Gonzalez [corrected to Gonzalez, Nadia]; Claudio, Vazquez [corrected to Vazquez, Claudio]; Carlos, Morales [corrected to Morales, Carlos]; Eduardo, Gonzalez-Toledo [corrected to Gonzalez-Toledo, Eduardo]

Abstract

The purpose of this paper is to show an unusual case of meningioma simulating arachnoid cyst on CT scan and MRI, diagnosed in a 63-year-old woman evaluated for headache and vision disorders. The meningioma shown is predominantly cystic with a small mural nodule enhancing after gadolinium and exhibiting diffusion restriction. Cystic portion of the tumor is hypodense on CT, and evidences fluid signal intensity on T1- and T2-weighted MR imaging.

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Figures

Figure 1
Figure 1
CT scan of the brain. A hypodense, extra-axial image is observed (asterisk), in the right frontoparietal region which imprints over the adjacent brain parenchyma. Lesion hypodensity is similar to the cerebrospinal fluid. A small mural hyperdense nodule (red arrow) is also identified.
Figure 2
Figure 2
Gadolinium-enhanced brain MRI. The lesion is hypointense on T1- and hyperintense on T2-weighted images (asterisk). Signal intensity is high on FLAIR images probably due to the cyst protein content. A small mural nodule is observed. After gadolinium administration, enhancement of the small mural nodule (white arrow) and of the peripheral cystic area is observed. There is a small hyperintense area on T2-weighted and FLAIR images (red arrow) around the medial aspect of the cyst, probably related to the presence of reactive gliosis.
Figure 3
Figure 3
Diffusion-weighted image (DWI) and apparent diffusion coefficient (ADC) map image. The cystic portion of the lesion shows facilitated diffusion, although slightly more restricted than CSF.
Figure 4
Figure 4
Spectroscopy. Increase in choline peak, decrease in NAA and creatine peaks, and increase in lactic and alanine peaks are observed.
Figure 5
Figure 5
Control brain MRI. Three months after surgery a control brain MRI shows no lesion recurrence.
See this image and copyright information in PMC

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