Asymptomatic giant arachnoid cyst

Clin Nucl Med. 2012 Oct;37(10):982-3. doi: 10.1097/RLU.0b013e3182638e00.


A 51-year-old male bricklayer without cerebral symptoms underwent whole-body FDG PET for suspicion of mediastinal sarcoidosis. PET/CT incidentally demonstrated a voluminous right frontal arachnoid cyst with normal glucose metabolism in the adjacent cortex. MRI demonstrated compression of the ipsilateral cerebral parenchyma and precentral, angulate, callosal, and superior frontal sulci. Functional bilateral finger-thumb paradigm MRI revealed right hemispheric reorganization of cortical motor activation with prominent activation between the inferior frontal gyrus and the postcentral gyrus.

Publication types

  • Case Reports

MeSH terms

  • Arachnoid Cysts / diagnostic imaging*
  • Arachnoid Cysts / pathology
  • Asymptomatic Diseases*
  • Fluorodeoxyglucose F18
  • Humans
  • Male
  • Middle Aged
  • Positron-Emission Tomography


  • Fluorodeoxyglucose F18