Arachnoid cyst

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[edit] Discussion

  • Most commmon congenital cystic abnormality of the brain.
  • Supratentorial locations in order of decreasing frequency
    • Middle cranial fossa
    • Perisellar cisterns
    • Subarachnoid space along convexities
  • Infratentorial locations in order of decreasing frequency
    • Retrocerebellar cistern
    • Cerebellopontine angle cistern
    • Quadrigeminal plate cistern

[edit] Differential diagnosis

[edit] Imaging Findings

[edit] CT

  • CSF density mass
  • No enhancement
  • +/- osseous remodeling

[edit] MRI

  • Will follow CSF signal intensity on all pulse sequences

[edit] Images

Patient #1: Left middle cranial fossa arachnoid cyst

Patient #2: CT and MR images demonstrate a hemorrhagic arachnoid cyst

[edit] See Also

[edit] External Links

[edit] References