PMC3385073_01
Axial T2-weighted magnetic resonance image showing significant perilesional edema (a). Axial enhanced T1-weighted magnetic resonance images (b) showing a well-enhanced, dural-based mass compressing the right temporal and frontal lobes, extending into the sylvian cistern (arrows) and filling the cortical sulci (arrow heads). It is specifically these subarachnoid components of the tumor in the sulci that showed relatively little mass effect. Coronal and sagittal enhanced T1-weighted images also showed unusual enhancement patterns (c, d)
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F1
Magnetic resonance (MR) imaging showed a mass with a similar signal intensity on the T1-weighted image and high signal intensity on the T2-weighted image [Figure 1], respectively. Coronal and sagittal enhanced T1-weighted images also showed unusual enhancement patterns [Figure 1].
Tumor cells have eccentric nuclei with abundant eosinophilic "rhabdoid" cytoplasm. (H and E, x40)
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F2
The tumor was globally composed of rhabdoid cells showing large eosinophilic cytoplasm and eccentrically placed, medium-sized round nuclei with prominent nucleoli [Figure 2].
Cytoplasm shows strong immunoreactivity for vimentin. Many cells in this area have round intracytoplasmic inclusion-like structures. (Immunohistochemical stain for vimentin, original magnification x40)
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F3
Immunohistochemically, the cytoplasm was strongly positive for vimentin [Figure 3].
Axial enhanced T1-weighted magnetic resonance image showing a resection of the temporal mass lesion
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F4
Postoperative course was uneventful and MR images demonstrated resection of the temporal mass lesion [Figure 4].