Sacral meningeal cyst
 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.
 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.
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 References for Sacral meningeal cyst
- Jack Diel, Orlando Ortiz, Richard A. Losada, Donald B. Price, Michael W. Hayt, and Douglas S. Katz. The Sacrum: Pathologic Spectrum, Multimodality Imaging, and Subspecialty Approach. RadioGraphics 2001 21: 83-104.