Long-term safety and efficacy of ethanol retention therapy via percutaneous approach and/or EUS guidance for symptomatic large hepatic cysts (with video)

Background and Objectives: Ethanol retention therapy (ERT) under EUS guidance or a percutaneous approach is a safe treatment for large symptomatic hepatic cysts. However, reports on the long-term outcomes after ERT are very rare. Therefore, we aimed to evaluate the long-term outcomes of ERT in symptomatic large hepatic cysts. Materials and Methods: A total of 47 consecutive patients with large symptomatic hepatic cysts treated at the Asan Medical Center from April 2009 to October 2017 were analyzed. Thirty patients with right hepatic cysts were treated with ERT through a percutaneous approach, and 14 patients with left hepatic cysts were treated with ERT under EUS guidance. Three patients were treated with ERT using both methods. Results: Of the 47 patients, 43 (91%) showed complete regression and four (9%) showed partial regression on abdominal computed tomography. Recurrence of the cysts was not observed during the follow-up surveillance of a median of 66 months. Conclusions: Percutaneous catheter drainage-guided ERT and EUS-guided ERT, based on their favorable long-term outcomes, may be considered as first-line treatments in patients with large symptomatic hepatic cysts.