Percutaneous Ligamentum flavum cyst rupture by interlaminar Epidural approach - A case report and literature review

. A ligamentum flavum cyst (LFC) is defined as a cystic formation arising from the ligamentum flavum. The majority of symptomatic cysts usually present with lower leg radiating pain. An 84-year-old man presented with left lower leg radiating pain caused by a ligamentum flavum cyst. Magnetic resonance imaging demonstrated a hyperintense extradural mass with a peripheral hypointense rim on T2-weighted images at the L4/5 level. Percutaneous cystic rupture by interlaminar epidural injection was performed. The patient came to the clinic four weeks, 12 weeks, and one year after the procedure and was symptom-free at the last visit. In conclusion, LFC can be treated by the interlaminar epidural approach and this procedure could be suggested as a good option for treating an LFC.