PMC4352640_01
Magnetic resonance imaging brain: T2-weighted coronal section (a), sagittal section (b) and T1-weighted contrast sagittal section (c), showing T2-weighted hyperintense and heterogeneously contrast enhancing, well defined extra-axial mass lesion in right middle cranial fossa with extension into the infratemporal fossa
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F1
T1 and T2-weighted images and was heterogeneously enhancing in postgadolinium scan. There was perilesional edema causing mass effect in the form of effacement of ipsilateral lateral ventricle and midline shift [Figure 1a-c].
Postoperative contrast magnetic resonance imaging brain sagittal (a) and coronal image (b) showing complete excision of tumor
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F2
Postoperative MRI brain revealed no residual tumor [Figure 2a and b].
H and E stained sections showing tumor arising from meninges (x100) (a). Cells displaying round to polygonal cells, central round nucleus, dispersed nuclear chromatin, inconspicuous nucleoli and moderate amount of clear cytoplasm (x400) (b)
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F3
On imunohistochemistry, Ki-67 index was 7% suggestive of CCM (aggressive variant) [Figure 3a and b].