Neurology
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Brett J. Theeler, MD, Joren B. Keylock, MD and Stephen M. Yoest, MD

From Madigan Army Medical Center, Department of Neurology, Tacoma, WA.


Figure 117
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  		Figure Sagittal and axial T1-weighted MR images, hematoxylin and eosin-stained specimen, and S100-stained specimen

Sagittal (A) and axial (B) T1-weighted MR images revealing a contrast-enhancing extra-axial mass lesion with indentation of the cortex, dural thickening, underlying vasogenic edema, and a projection into an intersulcal region. Hematoxylin and eosin-stained specimen (C) shows a lymphohistiocytic infiltrate with histiocytes demonstrating emperipolesis (lymphocytophagocytosis). S100-stained specimen (D) shows histiocytes positive for S100.

 




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