The thesis discusses the management and treatment of symptomatic non-parasitic liver cysts with a focus on simple cysts and PCLD ( Polycystic Liver Disease). It compares laparoscopic fenestration to open fenestration from the point of view of postoperative complications and recurrence rates. Additionally, the Non-surgical management of non-parasitic liver cysts is also discussed. Furthermore, it discusses the methods of diagnosis of such cases along with CT images showing the cysts. Lastly, the thesis also contains data that was obtained ethically from the University of Debrecen Institute of Surgery.