Case 7: 45-year-old man with sudden onset of vertigo, dysmetria, and somnolence. Case 7: 45-year-old man with sudden onset of vertigo, dysmetria, and somnolence.

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Presentation transcript:

Case 7: 45-year-old man with sudden onset of vertigo, dysmetria, and somnolence. Case 7: 45-year-old man with sudden onset of vertigo, dysmetria, and somnolence. A–D, On initial MR examination, performed 5.5 hours after onset, MR angiogram (not shown) displayed a partially thrombosed dolichobasilar artery, which was responsible for the mass effect on the brain stem and heterogeneous signal anterior to the pons on FLAIR images. Initial FLAIR image (A) (10002/148/1, TI = 2200) and DWI (B) fail to reveal a stroke lesion. On follow-up MR examination, performed 15 hours after onset, FLAIR image shows a small right-sided brain stem hyperintensity (arrowhead) (C), which is more clearly visible on DWI (D). Catherine Oppenheim et al. AJNR Am J Neuroradiol 2000;21:1434-1440 ©2000 by American Society of Neuroradiology