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Histological examination observed two cell populations, bipolar piloid cells with long, hire-like processes and smaller cells with short, cobweb-like processes as well as a biphasic growth pattern composed of compacted cellular areas with Rosenthal fibers and loose textured microcystic areas with eosinophilic granular bodies. (A), smear preparation, H&E, 400×; (B), tissue section, H&E, 200×; (C) and (D) tissue section, H&E, 400×.
