• Kyung-Hoon Kim, Su-Young Kim, Hwoe-Gyeong Ok, and Tae-Kyun Kim.
• Department of Anesthesia and Pain Medicine, School of Medicine, Pusan National University, Yangsan, Republic of Korea.
• Pain Physician. 2019 Sep 1; 22 (5): E451-E456.

BackgroundLumbar intraspinal synovial cyst (LISC) refers to a cyst that arises from the zygapophyseal joint capsule of the lumbar spine and contains serous or gelatinous fluid. In cases of LISCs resistant to conservative treatments, various minimally invasive percutaneous spinal techniques (MIPSTs) may be applied prior to open surgery.ObjectivesThe outcomes of 3-staged MIPSTs for the treatment of symptomatic LISCs resistant to conservative treatments were evaluated.Study DesignAn institutional review board approved retrospective chart review.SettingUniversity hospital inpatients referred to our pain clinic.MethodsReview of charts of all patients who underwent MIPSTs for symptomatic LISCs resistant to conservative treatments during a time period of 13 years at a university hospital pain clinic. Patients with symptomatic LISCs resistant to conservative treatments were treated with 3-staged MIPSTs, including image-guided intraarticular aspiration, cyst distention and rupture, and injection of corticosteroids (ARI), endoscopic cyst enucleation (ECE), and endoscopic superior facetectomy (ESF) by a single pain specialist. A symptom-free period after each intervention was evaluated. Recurrence was defined as the same recurrent symptomatic radicular pain with confirmation of the LISC on magnetic resonance imaging. All patients with a minimum follow-up time of 3 years were included.ResultsOf the 40 patients who underwent ARI, 3 patients failed to complete a follow-up and 19 patients (51.4%) who had recurring symptoms received ECE. Ten patients (52.6%) who had re-recurring symptoms after ECE received ESF. There was no recurrence after ESF.LimitationsThis retrospective and observational study with a limited number of patients does not represent a high level of evidence.ConclusionsThis information provided the recurrence rate after each intervention. Half of the patients who went on to receive ARI experienced recurrence, whereas half of the patients with recurrence who received ECE experienced re-recurrence. ESF treatment resulted in no recurrence within the 3-year study period.Key WordsConservative treatment, endoscopic surgical procedures, facet joint, intraarticular injection, minimally invasive surgical procedures, needle biopsy, nerve root compression, radiculopathy, synovial cysts.

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