Case report

An adult man with tinnitus underwent MR imaging of the internal acoustic meatuses. There was no previous brain imaging. His inner ear was normal, but T2-weighted axial images showed an extensive cluster of thin-walled, small T2-hyperintense foci of variable shapes in the region of corpus callosum and pericallosal region. A subsequent detailed MR scan of the brain confirmed a large cluster of small oval and curvilinear cystic lesions of cerebrospinal fluid (CSF) intensity, predominantly involving the body and genu of corpus callosum without corpus callosum atrophy. There was superior extension into the periventricular white matter of the frontoparietal region with minimal mass effect …