Background: Lumbar 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.
Objectives: The outcomes of 3-staged MIPSTs for the treatment of symptomatic LISCs resistant
to conservative treatments were evaluated.
Study Design: An institutional review board approved retrospective chart review.
Setting: University hospital inpatients referred to our pain clinic.
Methods: Review 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.
Results: Of 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 rerecurring symptoms after ECE received ESF. There was no recurrence after ESF.
Limitations: This retrospective and observational study with a limited number of patients does
not represent a high level of evidence.
Conclusions: This 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 words: Conservative treatment, endoscopic surgical procedures, facet joint, intraarticular
injection, minimally invasive surgical procedures, needle biopsy, nerve root compression,
radiculopathy, synovial cysts