PMC5508616_01
Contrast-enhanced T1-weighted axial and sagittal magnetic resonance image of the lesion in CP angle with homogenous enhancement, with compression on anterolateral aspect of pontomesencephalic junction.
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The lesion was isointense on T1-, hypointense on T2-weighted images with homogenous enhancement in post-contrast images (Fig. 1).
A, B. Histopathological sections of the tumor show cellular sheet of cells with infiltration of large mononuclear cells (Arrow) with central nucleolus and vesicular chromatin and abundant eosinophilic cytoplasm and good number of eosinophils. (A. H&E, X40. B. H&E, X400.) C-E. Immunohistochemical analysis of the tumor shows immunoreactivity for S-100 (C), CD1a (D), Vimentin (E).
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Permanent pathology was confirmed with immuno-histochemical staining, which demonstrated immune-reactivity for S100, vimentin and CD1a which established the final diagnosis for EG (Fig. 2).