Arachnoiditis is an inflammatory condition of the arachnoid mater or 'arachnoid', one of the membranes known as meninges that surround and protect the nerves of the central nervous system, including the brain and spinal cord. The arachnoid can become inflamed because of adverse reactions to chemicals, infection from bacteria or viruses, as the result of direct injury to the spine, chronic compression of spinal nerves, complications from spinal surgery or other invasive spinal procedures, or the accidental intrathecal injection of steroids intended for the epidural space.[1][2] Inflammation can sometimes lead to the formation of scar tissue and adhesion that can make the spinal nerves "stick" together,[3] a condition where such tissue develops in and between the leptomeninges.[4] The condition is extremely painful, especially when progressing to adhesive arachnoiditis. Another form of the condition is arachnoiditis ossificans, in which the arachnoid becomes ossified, or turns to bone, and is thought to be a late-stage complication of the adhesive form of arachnoiditis.[5]

Myelogram showing arachnoiditis in the lumbar spine

Signs and symptoms

Illustration of Arachnoiditis

Arachnoid inflammation can lead to many painful and debilitating symptoms which can vary greatly in each case, and not all people experience all symptoms.[3] Chronic pain is common, including neuralgia, while numbness and tingling of the extremities can occur with spinal cord involvement, and bowel, bladder, and sexual functioning can be affected if the lower part of the spinal cord is involved.[3] While arachnoiditis has no consistent pattern of symptoms, it frequently affects the nerves that supply the legs and lower back. Many patients experience difficulty sitting for long (or even short) periods of time due to discomfort or pain, or because of efferent neurological or other motor symptoms, such as difficulties controlling limbs. Difficulty sitting can be problematic for patients who have trouble standing or walking for long periods, as wheelchairs are not always helpful in such cases.


The root cause of the condition is not entirely clear, and it appears to have multiple causes, including iatrogenic cause from misplaced epidural steroid injection therapy when accidentally administered intrathecally (inside the dura mater, the sac enveloping the arachnoid mater),[2] or from contrast media used in myelography prior to the introduction of Metrizamide.[6] Other noninfectious inflammatory processes include surgery, intrathecal hemorrhage, and the administration of anesthetics (e.g. chloroprocaine), and steroids (e.g. prednisolone, triamcinolone acetonide). A variety of other causes exist, including infectious, inflammatory, and neoplastic processes. Infectious causes include bacterial, viral, fungal, and parasitic agents. Prior spinal surgery has been documented as a cause of arachnoiditis ossificans,[7] as well as for the adhesive form.[8] It can also be caused by long term pressure from either a severe disc herniation or spinal stenosis.[9][10][11]


For the ossificans form of the condition, unenhanced CT may better show the presence and extent of arachnoid ossifications, and is complementary to MRI, as MRI can be less specific and findings can be confused with regions of calcification or hemosiderin.[5][12]


Arachnoiditis is difficult to treat and treatment is generally limited to alleviation of pain and other symptoms.[3] While arachnoiditis may not yet be curable and can be significantly life-altering, management of the condition, including with medication, physical therapy, and if appropriate, psychotherapy, can help patients cope with the difficulties it presents.[3] Surgical intervention generally has a poor outcome and may only provide temporary relief,[3] but some cases of surgical success have been reported.[13] Epidural steroid injections to treat sciatic pain have been linked as a cause of the disease by the U.S. Food and Drug Administration as well as in other research, and are therefore discouraged as a treatment for Arachnoiditis as they will most likely worsen the condition.[2][4][14] Some patients benefit from motorized assistance devices such as the Segway or standing wheelchairs, although these types of devices may be beyond the reach of those with limited means. Standing endurance and vibration tolerance are considered before considering such devices in any case.


Arachnoiditis is a chronic disorder with no known cure,[3] and prognosis may be hard to determine because of an unclear correlation between the beginning of the disease and the appearance of symptoms. For many, arachnoiditis is a disabling disease that causes chronic pain and neurological deficits,[5] and may also lead to other spinal cord conditions, such as syringomyelia.[15][16]


  1. PDR US-FDA 2010 DataSheet | Depo-Medrol | Pfizer
  2. Nelson, D.A. and Landau, W.M., Intraspinal steroids: history, efficacy, accidentality, and controversy with review of United States Food and Drug Administration reports, Journal of Neurology, Neurosurgery, and Psychiatry, 70:433-443, 2001; doi:10.1136/jnnp.70.4.433. Accessed 2015-10-23.
  3. NINDS Arachnoiditis Information Page, National Institute of Neurological Disorders and Stroke, National Institutes of Health. Accessed 2015-10-23.
  4. Shaw, M.D., Russell, J.A., and Grossart, K.W., The changing pattern of spinal arachnoiditis, Journal of Neurology, Neurosurgery, and Psychiatry, 41(2):97–107 at 102, Feb. 1978; PMID 632824. Accessed 2015-10-23.
  5. Steel, Christopher J; Abrames, Erik L; O’Brien, William T (2015). "Arachnoiditis Ossificans – A Rare Cause of Progressive Myelopathy". The Open Neuroimaging Journal. 9 (1): 13–20. doi:10.2174/1874440001509010013. ISSN 1874-4400. PMC 4578143.
  6. Quiles M, et al. (1978). "Lumbar adhesive arachnoiditis. Etiologic and pathologic aspects". Spine. 3 (1): 45–50. doi:10.1097/00007632-197803000-00010. PMID 644392.
  7. Liu, Li-Di; Zhao, Song; Liu, Wan-Guo; Zhang, Shao-Kun (2015). "Arachnoiditis Ossificans After Spinal Surgery". Orthopedics. 38 (5): e437–e442. doi:10.3928/01477447-20150504-91. ISSN 0147-7447.
  8. Burton C. V. (1978). "Lumbosacral arachnoiditis". Spine. 3 (1): 24–30. doi:10.1097/00007632-197803000-00006. PMID 148106.
  9. Benner B.; Ehni G. (1978). "Spinal arachnoiditis. The postoperative variety in particular". Spine. 3 (1): 40–44. doi:10.1097/00007632-197803000-00009. PMID 644391.
  10. Benoit M, et al. (1980). "Postoperative Lumbar Epiduro-Arachnoiditis". Spine. 5 (5): 432–35. doi:10.1097/00007632-198009000-00007. PMID 6450453.
  11. Brodsky A. E. (1978). "Chronic spinal arachnoiditis. A postoperative syndrome that may signal its onset". Spine. 3 (1): 88–91. doi:10.1097/00007632-197803000-00017. PMID 644396.
  12. Maulucci, Christopher M.; Ghobrial, George M.; Oppenlander, Mark E.; Flanders, Adam E.; Vaccaro, Alexander R.; Harrop, James S. (2014). "Arachnoiditis ossificans: Clinical series and review of the literature". Clinical Neurology and Neurosurgery. 124: 16–20. doi:10.1016/j.clineuro.2014.06.024. ISSN 0303-8467.
  13. Tachibana, Toshiya; Moriyama, Tokuhide; Maruo, Keishi; Inoue, Shinichi; Arizumi, Fumihiro; Yoshiya, Shinichi (2014). "Subarachnoid-subarachnoid bypass for spinal adhesive arachnoiditis". Journal of Neurosurgery: Spine. 21 (5): 817–820. doi:10.3171/2014.7.SPINE131082. ISSN 1547-5654.
  14. Neal, Joseph M.; Kopp, Sandra L.; Pasternak, Jeffrey J.; Lanier, William L.; Rathmell, James P. (2015). "Anatomy and Pathophysiology of Spinal Cord Injury Associated With Regional Anesthesia and Pain Medicine" (PDF). Regional Anesthesia and Pain Medicine. 40 (5): 506–525. doi:10.1097/AAP.0000000000000297. ISSN 1098-7339.
  15. Brammah TB, Jayson MI (November 1994). "Syringomyelia as a complication of spinal arachnoiditis". Spine. 19 (22): 2603–5. doi:10.1097/00007632-199411001-00019. PMID 7855688.
  16. Ibrahim, George; Kamali-Nejad, Tara; Fehlings, Michael (2010). "Arachnoiditis ossificans associated with syringomyelia: An unusual cause of myelopathy". Evidence-Based Spine-Care Journal. 1 (02): 46–51. doi:10.1055/s-0028-1100914. ISSN 1663-7976. PMC 3623106.

Further reading

External resources
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