Histopathologic specimens of a well-differentiated and malignant astroblastoma.A, Well-differentiated astroblastomas are composed of astroblastic pseudorosettes,

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Figure 2. Histopathologic findings

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Histopathologic specimens of a well-differentiated and malignant astroblastoma.A, Well-differentiated astroblastomas are composed of astroblastic pseudorosettes, which are elongated tumor cells with broad or tapering processes extending to a central vessel ... Histopathologic specimens of a well-differentiated and malignant astroblastoma.A, Well-differentiated astroblastomas are composed of astroblastic pseudorosettes, which are elongated tumor cells with broad or tapering processes extending to a central vessel (arrow).B, Malignant astroblastomas contain hypercellular mitotically active regions that often display vascular proliferation or necrosis (arrowheads). John D. Port et al. AJNR Am J Neuroradiol 2002;23:243-247 ©2002 by American Society of Neuroradiology