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A WHO grade I slow growing tumor, more frequently affecting young adults. It is composed of small, uniform, mature cells resembling pineocytes with occasional large pineocytomatous rosettes. It may show a wide range of divergent phenotypes, including neuronal, glial, melanocytic, photoreceptor and mesenchymal differentiation. Pineocytoma generally has a relatively favorable prognosis. (Adapted from WHO)
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