Tarlov Cyst: Symptoms, Diagnosis and 7 Treatment Options
A Tarlov cyst is a fluid-filled sac around a spinal nerve root, usually in the sacrum at the base of the spine. Also called a perineural cyst, it contains cerebrospinal fluid (CSF), the fluid that surrounds the brain and spinal cord. Most cysts discovered on MRI are incidental findings. Some, however, are associated with nerve pain, pelvic symptoms, or changes in bladder and bowel function.
Finding a cyst does not automatically explain your pain, and it does not automatically mean you need surgery. The central question is: Do your symptoms and examination fit the affected nerves, and is another condition a better explanation? This guide covers that evaluation and seven management options, from observation to specialist procedures.
Key point: Treat the patient’s symptoms and nerve function, not an MRI measurement alone. An incidental cyst may need no intervention; persistent symptoms that plausibly match a cyst deserve careful evaluation.
Emergency warning signs
Go to an emergency department immediately for new inability to urinate, new loss of bladder or bowel control, new numbness around the genitals or anus (“saddle” numbness), or rapidly worsening leg weakness. These may indicate serious nerve compression, including cauda equina syndrome. Do not assume a known Tarlov cyst is the cause or wait for a routine appointment. Read more about cauda equina warning signs.
What is a Tarlov cyst?
Tarlov cysts develop along nerve root coverings, most often around sacral nerves such as S2 and S3. Nerve fibers may run within the cyst wall, which makes treatment more complex than simply removing an ordinary fluid pocket. These are not the same as facet joint synovial cysts, and a typical Tarlov cyst is not a tumor.
A meta-analysis involving 13,266 people estimated a pooled prevalence of approximately 4.2%, although rates differed substantially across imaging studies. Cysts were identified more often in women. This prevalence does not mean that 4.2% of people need treatment. [1]
The exact cause is not fully established. Proposed explanations include differences in nerve root coverings and CSF flow or pressure. An MRI cannot usually tell you why a particular cyst developed.
Tarlov cyst symptoms: when might the finding matter?
Symptoms depend on the affected nerves and may include:
- Sacral or buttock pain: discomfort low in the back, around the sacrum, or near the tailbone.
- Nerve pain: burning, tingling, numbness, or pain into a buttock or leg.
- Pelvic or perineal symptoms: pain or altered sensation around the pelvic floor, genitals, or the area between the genitals and anus.
- Functional changes: difficulty tolerating sitting, activity-related pain, or weakness.
- Bladder, bowel, or sexual symptoms: changes that require evaluation for both neurologic and non-neurologic causes.
Symptoms may worsen with prolonged sitting or activities that increase pressure, but this pattern is not specific to Tarlov cysts. Low back pain and pinched nerve root symptoms commonly arise from other conditions. Disc disease, spinal stenosis, hip or sacroiliac problems, peripheral neuropathy, and pelvic or urologic disorders can coexist with a cyst.
Urinary urgency alone does not prove that a cyst is symptomatic. Report persistent urinary, bowel, or sexual changes to your clinician; new emergency warning signs require immediate care.
How do doctors determine whether a Tarlov cyst is causing symptoms?
A useful evaluation starts with the actual MRI images, a symptom history, and a neurologic examination. Bring the images as well as the written report. Describe where you hurt, what makes symptoms worse, how long you can sit or walk, and any changes in strength, sensation, bladder function, or bowel function.
MRI and additional imaging
MRI shows the cyst’s location and relationship to nearby structures. If routine lumbar imaging does not adequately cover the sacrum, dedicated sacral MRI may help. The specialist reviews the involved nerves, associated bone changes, and the cyst’s connection to the surrounding CSF space. CT can clarify bone anatomy, while CT myelography may be used selectively when the CSF connection remains uncertain or affects procedure planning. These additional tests are not necessary for every incidental cyst.
Other testing and diagnostic procedures
EMG and nerve conduction studies may help investigate radiculopathy or peripheral neuropathy. A normal routine leg study does not automatically exclude a sacral nerve problem. Bladder or pelvic symptoms may warrant urologic, gynecologic, or pelvic floor assessment.
In selected cases, an experienced specialist may use a targeted local anesthetic block or cyst aspiration to assess symptom relevance. Relief supports a possible connection but does not guarantee that a later procedure will succeed. These tests require individualized risk assessment.
Does cyst size determine treatment?
No single size threshold establishes the need for surgery. Symptoms, neurologic findings, anatomy, and competing diagnoses matter together. Persistent or progressive symptoms should not be dismissed solely because a cyst is small, and a large cyst should not be treated solely because it is large.
7 Tarlov cyst treatment and management options
These options serve different purposes. Some control symptoms, some help clarify the diagnosis, and some directly address the cyst. They are not seven equally proven cures or a sequence every patient must follow.
1. Observation and education
An incidental cyst without matching symptoms usually does not need a cyst-directed procedure. Observation means documenting the finding, explaining which changes to report, and treating any more likely cause of pain. Follow-up imaging is individualized rather than automatically scheduled at a fixed interval.
2. Conservative symptom management
A plan may include pacing activities, reducing prolonged symptom-provoking positions, physical therapy, and medications chosen for the pain pattern and your medical history. Therapy should focus on tolerable movement and function. Pelvic floor therapy may be appropriate when examination identifies a relevant problem.
Medication can reduce pain without eliminating the cyst. Discuss benefits and adverse effects with your clinician, and modify exercises that repeatedly worsen nerve symptoms. Conservative care should not delay assessment of progressive weakness or emergency bladder and bowel changes.
3. Selected image-guided injections
Targeted injections may help evaluate a suspected pain source or treat a separate inflammatory nerve or joint problem. They do not reliably shrink or cure a Tarlov cyst. The physician must review the cyst’s location before planning an epidural or other sacral procedure so that the needle path accounts for the abnormal anatomy.
Risks include bleeding, infection, nerve injury, and unintended puncture of a cyst or the CSF space. A generic injection plan should not substitute for evaluating whether the cyst actually matters.
4. CT-guided cyst aspiration
A specialist can remove cyst fluid through a needle under CT guidance in selected patients. Aspiration may provide temporary relief and help assess whether reducing cyst pressure changes symptoms. Because the cyst may refill, aspiration alone is often not durable.
Possible complications include nerve irritation or injury, bleeding, infection, and CSF leakage or headache. It is a specialist procedure rather than a routine office drainage treatment. A 2019 surgical-selection cohort used aspiration response as one part of its assessment, not as a stand-alone diagnostic guarantee. [5]
5. Aspiration with fibrin sealant
For selected cysts, aspiration is followed by fibrin sealant injection to limit refilling. A wide connection to the spinal CSF space generally makes this approach unsuitable because sealant could pass into that space. Defining the anatomy is therefore essential. [2]
In a 2016 observational cohort of 213 selected patients, approximately 82% of those assessed were satisfied at one year, and 74% of those followed were satisfied at three to six years. Satisfaction is not the same as complete recovery, and these results do not apply to every cyst or patient. [3]
Potential risks include pain flare, nerve irritation, CSF leakage, infection, and reactions to the injected material. Discuss suitability, product use, recurrence, and alternatives with the treating specialist.
6. Specialist microsurgery
Surgery may be considered when symptoms are convincingly linked to the cyst, neurologic findings or disability justify intervention, and the anatomy favors an operation. Selected procedures aim to decompress the involved nerve while preserving nerve tissue. Techniques include fenestration, repair or reduction of the cyst wall, and wrapping; the approach depends on the anatomy and surgeon’s assessment.
In a 97-patient surgical series published in its 2025 journal issue, 76% had a good or excellent patient-reported outcome, while the complication rate was 17.5%. This retrospective study does not establish that surgery is superior to percutaneous treatment. [4]
Risks include CSF leakage, wound problems, infection, persistent or worsened pain, nerve injury, and new or worsened bladder, bowel, or sexual dysfunction. A cyst may contain functioning nerve tissue, so complete removal is not automatically the safest goal. Progressive neurologic problems may warrant prompt surgical assessment without first trying every other option.
7. Multidisciplinary care for persistent pain
Some patients continue to have pain after treatment or are not suitable candidates for cyst-directed intervention. Coordinated care may include medication review, rehabilitation, sleep and activity strategies, and psychological approaches to coping with chronic pain. These approaches support function and do not imply that symptoms are imaginary.
Neuromodulation may occasionally be discussed for carefully selected refractory neuropathic pain. Tarlov-specific evidence is limited, and stimulation does not drain a cyst or decompress a nerve. It should not be presented as an established cyst treatment or replace evaluation of progressive deficits.
How strong is the evidence for treatment?
There is no universally accepted best treatment for all symptomatic Tarlov cysts. Much of the published evidence comes from observational cohorts and specialist centers. Patients selected for surgery may differ from those selected for fibrin sealant, and studies measure outcomes differently.
Reported improvement rates are useful for discussion but cannot predict your individual result or provide a fair head-to-head comparison. Ask what improvement means in the proposed treatment: less pain, better sitting tolerance, improved nerve function, or another measurable goal. Recovery of longstanding neurologic dysfunction may be incomplete even when pain improves.
Questions to ask before a procedure
- Which symptoms and examination findings suggest that this cyst is the cause?
- What other explanations have been considered?
- Does the cyst’s CSF connection affect the proposed procedure?
- How much experience does the treating specialist have with this technique?
- What are the expected benefits, major risks, and chances of needing further treatment?
- What follow-up, recovery support, and insurance authorization will be needed?
Tarlov cyst evaluation on Long Island
A thoughtful first step is to determine whether the cyst, another spine problem, or several conditions best explain your symptoms. At SpinePain Solutions, an evaluation can help assess the pain pattern, review imaging, and develop an appropriate plan. When cyst-directed intervention is being considered, specialist neuroradiology or neurosurgical evaluation may be needed.
Bring your MRI images, report, prior treatment records, and a short symptom timeline. Contact our office to request a consultation, or review our Bay Shore, Commack, and Farmingdale office locations. This overview does not indicate that every procedure described is offered at our practice.
Frequently asked questions
Are Tarlov cysts dangerous?
Most are incidental and require no cyst-directed treatment. Some cause nerve-related symptoms. New urinary retention, loss of bowel or bladder control, saddle numbness, or rapidly worsening leg weakness requires emergency evaluation, regardless of a known cyst.
What size Tarlov cyst needs surgery?
There is no universally accepted size cutoff. Treatment depends on symptoms, examination, nerve involvement, cyst anatomy, and other possible causes of pain. A large cyst may be incidental, while a smaller cyst may be symptom-relevant.
Can a Tarlov cyst cause sciatica or pelvic pain?
Yes, a symptomatic cyst may cause buttock or leg nerve pain, sacral pain, or pelvic and perineal symptoms. These symptoms also have other causes, so an MRI finding alone does not establish the diagnosis.
Is surgery the only treatment?
No. Options include observation, individualized symptom management, selected diagnostic or therapeutic injections, and specialist CT-guided aspiration with or without fibrin sealant. Surgery is considered when symptoms and anatomy justify its risks.
Can Tarlov cysts recur after treatment?
Yes. Fluid can reaccumulate, especially after aspiration alone. Recurrence and persistent symptoms are also possible after fibrin sealant or surgery. No procedure guarantees permanent relief.
Does physical therapy shrink a Tarlov cyst?
Physical therapy does not reliably shrink the cyst. An individualized program may improve mobility, conditioning, and overlapping musculoskeletal or pelvic floor symptoms. Exercises that repeatedly provoke nerve symptoms should be modified.
Do I need another MRI if my lumbar MRI shows a sacral cyst?
Not always. A specialist may request dedicated sacral MRI if the existing study does not adequately show the cysts, their nerve relationships, or relevant anatomy. Repeat imaging depends on symptoms and the clinical question.
Dr. Amit Sharma & our minimally invasive pain & spine team.
References
- Klepinowski T, et al. Global incidence of spinal perineural Tarlov’s cysts and their morphological characteristics: a meta-analysis of 13,266 subjects. Surgical and Radiologic Anatomy. 2021.
- Murphy K, et al. Management of Tarlov cysts: an uncommon but potentially serious spinal column disease—review of the literature and experience with over 1000 referrals. Neuroradiology. 2024; published online 2023.
- Murphy K, et al. Treatment of 213 patients with symptomatic Tarlov cysts by CT-guided percutaneous injection of fibrin sealant. AJNR American Journal of Neuroradiology. 2016;37:373–379.
- Abdi D, et al. Operative treatment of Tarlov cysts—outcomes and predictors of improvement after surgery: a series of 97 consecutive patients and a systematic review of literature. Global Spine Journal. 2025;15:1041–1048; published online 2023.
- Management of perineural (Tarlov) cysts: a population-based cohort study and algorithm for the selection of surgical candidates. Acta Neurochirurgica. 2019.
Medical disclaimer: This content is for general education and does not replace individualized medical evaluation, diagnosis, or treatment. A Tarlov cyst on MRI does not by itself establish the cause of symptoms. Treatment suitability, benefits, and risks vary. For new urinary retention, loss of bowel or bladder control, saddle numbness, or rapidly worsening weakness, seek emergency care immediately.
