Which are the causes of Tarlov Cyst?

The exact cause of a Tarlov cyst remains unknown, though current research suggests they develop as a result of increased cerebrospinal fluid (CSF) pressure or congenital weakness in the nerve root sheath.

Pathophysiology and Mechanisms

Think of a Tarlov cyst like a tiny, fluid-filled blister that forms on the nerve roots, typically in the sacral region of the spine. While we do not know exactly why these form in some people and not others, the most widely accepted theory involves a "one-way valve" mechanism. In this model, CSF enters the nerve root sheath but cannot flow back out, causing the sheath to balloon and compress the surrounding nerve fibers. This pressure on the nerve is what leads to the characteristic pain and neurological symptoms associated with Tarlov cyst disease.

Genetic and Environmental Factors

Currently, there are no specific genes or chromosomal mutations identified as the primary cause of Tarlov cyst formation. It is not considered an inherited condition in the traditional sense, though some researchers investigate whether a congenital weakness in the connective tissue of the nerve roots might be hereditary. There is no evidence that environmental triggers, autoimmune processes, or infections cause these cysts. Because the underlying etiology is not fully understood, clinicians distinguish between a "cause"—the biological trigger—and "risk factors," such as physical trauma or heavy lifting, which may cause an asymptomatic Tarlov cyst to suddenly become symptomatic.

Ongoing Research

Medical researchers continue to study why some Tarlov cyst cases remain asymptomatic for a lifetime while others become debilitating. Current efforts are focused on high-resolution imaging techniques to better understand the fluid dynamics of the spinal canal. By mapping how CSF interacts with the nerve root, researchers hope to determine why certain cysts expand and cause damage to the muscular and urinary systems. Understanding these mechanisms is the critical next step in moving beyond simple pain management toward more targeted surgical or medical interventions for those living with a Tarlov cyst.

Medical Disclaimer: This information is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• Orphanet: Rare Disease Database


• The Tarlov Cyst Foundation