Supplementary Material for: ENDOSCOPIC ULTRASOUND-GUIDED DRAINAGE OF HEPATIC FLUID COLLECTIONS: INSIGHTS FROM A CASE SERIES

Background and Aims: Hepatic cysts, commonly discovered incidentally, can become symptomatic due to complications like infection, rupture, or mass effect. Traditional management options include percutaneous drainage, open surgical or laparoscopic deroofing, and liver resection. We present a case series of three patients with complex fluid collections in the liver managed by endoscopic ultrasound-guided drainage using lumen-apposing metal stent (LAMS) placement. While reports exist from other countries, our study contributes a series of cases from the United States.
Patient Details: Three patients, average age 75 years (two men, one woman), underwent endoscopic ultrasound (EUS)-guided drainage using LAMS for an infected liver cyst, infected liver hematoma within a hepatocellular carcinoma (HCC) lesion, and a symptomatic simple liver cyst, respectively. All the hepatic fluid collections were in the left hepatic lobe and had an average diameter of 11 centimeters (cm). Only the female patient with a symptomatic cyst had prior percutaneous drainage.
Methods and Results: Successful LAMS placement was achieved in all cases. Clinical success, defined as cyst resolution or significant size reduction, was observed in all patients. The superinfected liver cyst showed complete resolution, yet the stent remained in place as the patient transitioned to hospice and subsequently passed away. In the case of the superinfected liver hematoma, the stent was removed after two months. No recurrence was observed in follow-up imaging 8 months later, and the patient passed away. The symptomatic simple liver cyst patient had the stent removed 15 months later, with no recurrence in imaging 11 months post-stent removal.
Conclusion: EUS-guided LAMS placement emerges as a less invasive and viable option for treating symptomatic and/or infected hepatic fluid collections compared to surgery or percutaneous drainage. While it may be a preferable choice in institutions with the requisite expertise, further studies are essential to establish its definitive role as a first-line intervention.