A 19-year-old man with a nonenhancing WHO grade III anaplastic astrocytoma. A 19-year-old man with a nonenhancing WHO grade III anaplastic astrocytoma.

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Presentation transcript:

A 19-year-old man with a nonenhancing WHO grade III anaplastic astrocytoma. A 19-year-old man with a nonenhancing WHO grade III anaplastic astrocytoma. His chief symptoms were left lower extremity weakness, hypoesthesia, and lower back pain starting 6 months earlier. A and B, Axial and sagittal T2-weighted MR images show a well-demarcated hyperintense mass at the center of the conus medullaris. C, The mass is hypointense on the sagittal T1-weighted image. D and E, Contrast-enhanced axial and sagittal T1-weighted images show that the mass is not enhanced at all. H.S. Seo et al. AJNR Am J Neuroradiol 2010;31:498-503 ©2010 by American Society of Neuroradiology