Case 3. Case 3. A and B, Contrast-enhanced T1-weighted images (spin-echo sequence with parameters of 600/14 [TR/TE]) show ringlike enhancements in the.

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Presentation transcript:

Case 3. Case 3. A and B, Contrast-enhanced T1-weighted images (spin-echo sequence with parameters of 600/14 [TR/TE]) show ringlike enhancements in the left middle cerebral peduncle and pons and in the right cingulate gyrus (arrowheads).C, The slices of 4-mm thickness show linear enhancements in the pons (arrows).D and E, T2-weighted MR images (fast spin-echo sequence with parameters of 4500/96 [TR/TE]) show that the ringlike, enhanced lesions are hypointense to isointense with gray matter (arrowheads). There are hyperintense areas surrounding these lesions, suggesting perifocal edema (arrow).F, Chest radiograph shows multiple nodular shadows in both lung fields (arrows).G, Open brain biopsy specimen from the left middle cerebellar peduncle shows perivascular lymphoid-cell infiltration with partial nuclear atypia (arrows). Ukihide Tateishi et al. AJNR Am J Neuroradiol 2001;22:1283-1290 ©2001 by American Society of Neuroradiology