A 61-year-old woman who had been followed for a hepatic cyst at another hospital since 1988 was seen at the department of internal medicine in our hospital on January 6, 2003, because a solid portion in the cyst was showed by abdominal ultrasonography at a clinical survey in the hospital in December. Abdominal CT and magnetic resonance imaging scans revealed a cystic lesion 9cm in longer diameter in the S6 of liver and an elevated lesion 2cm in size in the cyst. Cystic adenoma or adenocarsinoma of the liver was suspected and the patient was referred to the department. At surgery, the tumor was present on the surface of the liver S6 and showed an extrahepatic protrusion, but there were no adhesions between the tumor and surroundings. A right lobectomy of the liver was thus carried out. On the section the inner part of the cyst was filled with brown exudate and yellowish white spongiform material, and the elevated lesion 2cm in longer diameter was identified in the inside of the cyst. The pathological diagnosis of the solid portion was cavernous hemangioma and the spongiform material was clarified to be crystallized cholesterin. It is etiologically thought that, since the hepatic lesion had been observed as a cyst for a long time, an angioma existed in the cystic wall penetrated inside of the cyst and cholesterin in the blood crystallized.