Takeaway
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.