Tumefactive perivascular spaces

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  • 40-year-old patient presenting with headache.
  • There was chronic ventriculomegaly although the periventricular oedema had increased since imaging 1 year prior.
  • CSF outflow through the sylvian aqueduct was impaired by cystic lesions in the right paramedian thalamus and in the midbrain.
  • The cysts had not changed in 1 year and there was no soft tissue component or pathological enhancement to indicate a neoplasm.