MR images.A, Axial view T2-weighted MR image reveals a low intensity lesion occupying the right mastoid with associated hyperintense debris.B, Axial view.

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High-signal-intensity lesions on T2-weighted MR images

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Presentation transcript:

MR images.A, Axial view T2-weighted MR image reveals a low intensity lesion occupying the right mastoid with associated hyperintense debris.B, Axial view T1-weighted image. MR images.A, Axial view T2-weighted MR image reveals a low intensity lesion occupying the right mastoid with associated hyperintense debris.B, Axial view T1-weighted image. The lesion is homogeneously isointense to brain.C, Coronal view T2-weighted MR image shows infiltration of the otic capsule, but the signal intensity of the lateral and superior semicircular canals is normal.D, Axial view contrast-enhanced T1-weighted MR image shows homogeneous enhancement of the lesion, with an extensive regular thickening and enhancement of the dura of the convexity and of the right edge of the tentorium (arrowheads).E, MR venogram shows patency of the right sigmoid sinus, which is slightly reduced in size (arrow). Roberto Gasparotti et al. AJNR Am J Neuroradiol 2003;24:2092-2096 ©2003 by American Society of Neuroradiology