PMC3238494_01
Sagittal and axial pre- and Postcontrast MR images. (a) Sagittal image without gadolinium showing a homogenous lesion in the fourth ventricle. (b) Axial image without gadolinium showing the lesion. (c) Sagittal postcontrast image showing a heterogeneous enhancement of the lesion. (d) Axial postcontrast also showing heterogeneous enhancement.
CRIM2011-165954.001.jpg
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fig1
An MRI with contrast of the brain revealed a 1.8 cm x 1.8 cm x 2.0 cm heterogeneously enhancing lesion in the posterior fourth ventricle (Figure 1).
Schwannoma characterized by Antoni A and Antoni B architecture (hematoxylin and eosin x10).
CRIM2011-165954.002.jpg
PMC3238494_01_CRIM2011-165954.002.jpg
fig2
Antoni A and Antoni B areas with Verocay bodies characteristic of schwannomas (Figure 2). Areas of chronic inflammation, hemosiderin pigment deposition, and thickened blood vessels were seen.