Synovial and Tarlov cysts in the S1 dorsal foramen


  • The prevalence of lesions compromising access to the sacral (S1) dorsal foramen is 5%, and Tarlov cysts occur more frequently than synovial cysts.

Why this matters

  • Lumbar transforaminal epidural steroid injections (TFESIs) are a procedure used in people with radicular pain, such as that caused by disc herniations.

  • Understanding the characteristics of synovial and Tarlov cysts in the region may improve clinical outcomes for patients undergoing TFESIs.