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. 2014:2014:524574.
doi: 10.1155/2014/524574. Epub 2014 Mar 13.

A pilocytic astrocytoma mimicking a clinoidal meningioma

Christopher S Hong  1 , Norman L Lehman  2 , Eric Sauvageau  1
Affiliations

A pilocytic astrocytoma mimicking a clinoidal meningioma

Christopher S Hong et al. Case Rep Radiol. 2014.

Abstract

Pilocytic astrocytomas and meningiomas are benign, primary brain tumors that may involve the optic tract. Classically, the presence of a dural "tail" sign may differentiate a meningioma from other intracranial lesions. In this report, we describe a mass with the typical appearance of a clinoidal meningioma on magnetic resonance imaging (MRI) but postoperatively diagnosed as a pilocytic astrocytoma. This case illustrates the rare occurrence of a pilocytic astrocytoma mimicking a meningioma on MRI.

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Figures

Figure 1
Figure 1
(a) Axial, (b) coronal, and (c) sagittal T1-weighted MRI showing a homogenously enhancing lesion, measuring 2.9 × 3.0 × 2.0 cm in the right clinoidal region. There is probable extension into the right optic canal, sphenoid sinus, right temporal fossa, and possibly right cavernous sinus, suggestive of a right clinoidal meningioma.
Figure 2
Figure 2
(a) The tumor consists of piloid cells and shows abundant mucin and Rosenthal fibers (upper left) (H&E stain; original magnification 200x). (b) A few perivascular pseudorosettes were noted, here in longitudinal section (H&E stain; original magnification 200x).
See this image and copyright information in PMC

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