Liver 13x12mm cysts are usually asymptomatic and not serious. Liver cyst is a common disease in hepatobiliary surgery, generally refers to non-parasitic liver cysts, parasitic liver cysts are called hepatic cysts, liver cysts to congenital liver cysts are most common, its growth is slow, mostly asymptomatic, most often found during imaging or abdominal exploration. The indications for surgery for liver cysts are that the cysts are large, or there are obvious compression symptoms, such as gastrointestinal symptoms of compression of other organs, then it is necessary to decide whether to perform cyst windowing, decapitation, partial resection of the liver lobe or segment depending on whether it is a single or multiple cyst. Liver 13x12mm belongs to small cysts, if there is no indication of surgery, it is not serious, regular follow-up can be, the specific treatment please consult a professional physician.