Sacral meningeal cyst

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[edit] Discussion of Sacral meningeal cyst

  • Sacral meningeal cysts are common and are often observed during cross-sectional imaging of the lumbosacral spine.
  • These developmental lesions are referred to by various terms in the medical literature, including perineural cyst, Tarlov cyst, sacral arachnoid cyst, and occult intrasacral meningocele.


  • Sacral meningeal cysts are abnormal dilatations of the meninges within the sacral canal or foramina.
  • These cysts can be categorized according to whether they communicate with the subarachnoid space.
    • Those that communicate freely with the subarachnoid space are referred to as perineural or Tarlov cysts.
    • The less common variant lacks free communication with the subarachnoid space and can be referred to as a sacral meningeal cyst.
  • In either type of cyst, the pulsations of the cerebrospinal fluid or raised intraspinal pressure can erode and remodel the sacral canal or involved sacral foramen.


  • Although the cysts are usually asymptomatic, large cysts can manifest as neurologic symptoms.
  • Symptomatic cysts tend not to communicate with the subarachnoid space.
  • Percutaneous treatment strategies for symptomatic sacral cysts include cyst aspiration and fibrin glue therapy.


[edit] Imaging Findings for Sacral meningeal cyst

  • The enlarged sacral canal or foramen and the relationship to the sacral nerve roots is well demonstrated on MR images.
  • CT does show the surrounding thinned cortical margins.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Sacral meningeal cyst