Case 1. Case 1. A, Contrast-enhanced T1-weighted axial image (spin-echo sequence with parameters 600/14 [TR/TE]) shows an enhanced lesion from the splenium.

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Presentation transcript:

Case 1. Case 1. A, Contrast-enhanced T1-weighted axial image (spin-echo sequence with parameters 600/14 [TR/TE]) shows an enhanced lesion from the splenium of the corpus callosum extending to the right parietal white matter. There is a small area of necrosis within the mass (arrow). Nodular and multiple punctate enhancements are seen in the white matter (arrowhead).B, T2-weighted image (fast spin-echo sequence with parameters of 4000/96 [TR/TE]) shows a hyperintense mass (arrow) and surrounding edema.C and D, Contrast-enhanced T1-weighted images show multiple punctate enhancements in the pons and cerebral white matter bilaterally.E and F, T2-weighted axial image shows patchy hyperintense areas in the pons and cerebral white matter bilaterally (arrows).G, Stereotactic biopsy specimen from the right parietal lobe shows small lymphoid cells, microglia, and macrophages, which were prominent in the perivascular space (arrow).H, Contrast-enhanced T-weighted image 6 months after radiation therapy shows that the mass has almost disappeared. Ukihide Tateishi et al. AJNR Am J Neuroradiol 2001;22:1283-1290 ©2001 by American Society of Neuroradiology