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Histological appearances of atypical neurofibromatous tumors of uncertain biologic potential (ANNUBP). A. Tumor with loss of neurofibroma architecture and increased vascularity (not enough for ANNUBP by itself). B. Prominent nuclear atypia without high cellularity or mitoses (not enough for ANNUBP by itself). C. Increased cellularity with a fascicular pattern (loss of neurofibroma architecture), but without mitotic activity. D. Increased cellularity and mitotic activity.
