A 25-year-old man evaluated for long-term migraine problems.

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Presentation transcript:

A 25-year-old man evaluated for long-term migraine problems. A 25-year-old man evaluated for long-term migraine problems. A, T2-weighted image shows a small vascular flow void (arrow) surrounded by an ill-defined region of mixed intensities in the left superior frontal gyrus. B, SWI depicts numerous fine well-delineated anomalous medullary veins that converge into a dilated transcortical collector vein. This forms the classic “caput medusa.” C, Postcontrast 3D T1-weighted image reveals the dilated medullary veins and an enlarged collector vein in excellent agreement with SWI. S. Mittal et al. AJNR Am J Neuroradiol 2009;30:232-252 ©2009 by American Society of Neuroradiology