Ahmad Alkhasawneh,Arun Gopinath,Brett Baskovich,Civan Altunkaynak,Noor Marji,Ziad Awad, Upper Abdominal Primary Retroperitoneal Cyst with Unusual Urothelial Histogenesis - An Uncommon Presentation Masquerading as a Hepatic Cyst Surgical Case Reports 2020 2613-5965 http://dx.doi.org/10.31487/j.SCR.2020.01.01 https://www.sciencerepository.org/upper-abdominal-primary-retroperitoneal-cyst_SCR-2020-1-101 Abstract: Background: Benign retroperitoneal cysts are uncommon. There is a paucity of literature on primary upper abdominal retroperitoneal cysts of urothelial histogenesis. We report an uncommon presentation of urothelial cyst clinically mimicking a hepatic cyst. Case presentation: A 21-year old female patient was admitted with intermittent abdominal pain of 9 months duration diagnosed on radiology as a right hepatic cyst. Laparoscopic resection and pathologic examination revealed a primary retroperitoneal cyst with a urothelial histogenesis. This is an unusual clinical presentation of a rare lesion mimicking a hepatic cyst. Conclusion: This case highlights the unusual anatomic location and the rare occurrence of an upper abdominal retroperitoneal urothelial cyst.Keywords: Retroperitoneal cyst, urothelial histogenesis, mimicking hepatic cyst