Spinal arachnoid web-a review article
Haitham Ben Ali1, Preci Hamilton1, Stefan Zygmunt1
1Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, UK.
Abstract:
The spinal arachnoid web is an abnormal formation of an arachnoid membrane in the subarachnoid space. It is a rare entity with some degree of uncertainty surrounding its etiology. It can result in a displacement of the spinal cord causing pain and neurological symptoms as well as blockage of cerebrospinal fluid (CSF) flow and subsequent syringomyelia. The syrinx resulting from the altered CSF flow dynamics has been described to assume variable positions relative to the web itself. The "scalpel sign" is regarded as a pathognomonic feature of a spinal arachnoid web. The arachnoid web, however, is relatively thin and may be elusive of routine radiological investigations. As such, a myriad of preoperative and intraoperative investigations have been postulated to improve the sensitivity of detecting this abnormality. Management of spinal arachnoid webs ranges from conservative management to surgical excision where in the latter, the extent of excision remains the subject of debate. The authors herein present a review of the available information on this rare topic.
Insights
Spinal arachnoid webs are rare spinal cord abnormalities that can cause neurological symptoms and syringomyelia due to cerebrospinal fluid (CSF) blockage. Diagnosis and surgical management of these webs remain challenging.
Area of Science:
- Neurosurgery
- Neurology
- Radiology
Background:
- Spinal arachnoid webs are rare malformations of the arachnoid membrane within the subarachnoid space.
- Etiology is uncertain, but they can displace the spinal cord, causing pain, neurological deficits, and cerebrospinal fluid (CSF) flow obstruction.
- This obstruction can lead to syringomyelia, with syrinx position varying relative to the web.
Purpose of the Study:
- To review the current understanding of spinal arachnoid webs.
- To discuss diagnostic challenges and potential investigations.
- To summarize management options, including surgical considerations.
Main Methods:
- Literature review of spinal arachnoid webs.
- Analysis of diagnostic features, including the "scalpel sign".
- Review of treatment strategies, from conservative care to surgical excision.
Main Results:
- Spinal arachnoid webs are often subtle and difficult to detect on routine imaging.
- The "scalpel sign" is a key diagnostic indicator.
- Management strategies vary, and the extent of surgical intervention is debated.
Conclusions:
- Spinal arachnoid webs are rare but significant causes of spinal cord dysfunction.
- Improved diagnostic sensitivity and standardized surgical approaches are needed.
- Further research is warranted to clarify etiology and optimize treatment outcomes.
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