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. 2023 May 15;17(2):299–312. doi: 10.1007/s12105-023-01548-8

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Fig. 1 — ONB is composed of lobules and nests of neuroectodermal cells that are surrounded by hypervascular stroma (A, × 10). The tumor cells have syncytial borders and monotonous round to oval nuclei with speckled chromatin (B, × 40). Low grade ONB tends to have abundant neurofibrillary stroma with pseudorosette formation (C, × 20). High grade ONB shows increased mitotic activity and necrosis (D, × 20)