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Figure 14a. Anaplastic oligoastrocytoma. (a) Axial CT image shows a heterogeneous mass (arrows) with calcifications in the right frontal lobe. (b) Axial T1-weighted MR image shows heterogeneous low signal intensity of the mass, which has both soft-tissue (s) and cystlike (c) components. (c) Axial fluid-attenuated inversion-recovery MR image shows similar heterogeneity of the mass. (d) Axial contrast-enhanced T1-weighted MR image shows irregular ringlike enhancement of the mass and abnormal leptomeningeal enhancement.
