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Pineocytoma, also known as a pinealocytoma, is a benign, slowly growing tumor of the pineal gland. Unlike the similar condition pineal gland cyst, it is uncommon. ==Diagnosis== Pineocytomas are diagnosed from tissue, i.e. a brain biopsy. They consist of: *cytologically benign cells (with nuclei of uniform size, regular nuclear membranes, and light chromatin) and, *have the characteristic pineocytomatous/neurocytic rosettes, which is an irregular circular/flower-like arrangement of cells with a large meshwork of fibers (neuropil) at the centre. Pineocytomatous/neurocytic rosettes are superficially similar to Homer-Wright rosettes; however, they differ from Homer-Wright rosettes as they have (1) more neuropil at centre of the rosette and, (2) the edge of neuropil meshwork irregular/undulating. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pineocytoma」の詳細全文を読む スポンサード リンク
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