A case of colloid carcinoma arising in association with intraductal papillary neoplasm of the liver.

Colloid carcinoma of the liver is very rare, and its clinicopathologic features have not been well characterized yet. We describe herein a case of colloid carcinoma of the liver. Imaging revealed a lobulated mass, measuring 12 cm in diameter at the right lobe of the liver with direct invasion of adjacent peripheral intrahepatic bile ducts. Right hemihepatectomy of the liver was performed according to the possibility of the tumor's malignant behavior. Histopathological examination of the specimen revealed large extracelluar stromal mucin pools containing floating cuboidal to columnar neoplastic cells without ovarian-like stroma. This case seemed to be colloid carcinoma arising in association with intraductal papillary neoplasm of the liver.