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Figure 11b. Oligoastrocytoma. (a) Axial CT image shows a hypoattenuating mass (arrow) in the left frontal lobe. (b) Axial T1-weighted MR image shows low signal intensity of the mass with mild exophytic extension beyond the normal cortical margin. (c) Axial T2-weighted MR image shows heterogeneous high signal intensity of the mass. (d) Axial contrast-enhanced MR image shows only a small focal region of enhancement (arrowhead) in the mass. (e) Intraoperative photograph shows the mass protruding beyond the normal cortical margin of the brain.
