A. Wrong, The ectomesenchymal component showed hypercellularity, marked atypia and increased mitosis.
B. Right, The ectomesenchymal component showed hypercellularity, marked atypia and increased mitosis, while the epithelial component is totally bland. It could arise de novo, however over half of the cases arise from a benign precursor such as ameloblastic fibroma, as presented in this case.
C. Wrong, The malignant features could be seen in the ectomesenchyme only, while the epithelial component is totally bland.
B. Right, The ectomesenchymal component showed hypercellularity, marked atypia and increased mitosis, while the epithelial component is totally bland. It could arise de novo, however over half of the cases arise from a benign precursor such as ameloblastic fibroma, as presented in this case.
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