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Proposed histological parameters for grading of medulloepithelioma of the eye. a Grade I (benign) medulloepithelioma. Original magnification ×100. b Grade II medulloepithelioma, local invasion. Original magnification ×25. c-e Pleomorphism, mitotic activity in Homer Wright rosettes, Flexner-Wintersteiner rosettes and fleurettes. Original magnification ×630. f Grade III medulloepithelioma with extrascleral extension.
