title: Hepatocellular carcinoma eats medullary thyroid carcinoma, a case of tumor-in-tumor metastasis.
abstract: Carcinoma metastasis to the thyroid is uncommon, but may be increasing.  We describe here a patient with a metastasis of hepatocellular carcinoma (HCC) presenting within a medullary thyroid carcinoma (MTC).  The thyroid tumor was detected synchronously with the hepatic lesion by FDG-PET imaging, and HCC metastasis within MTC was confirmed by histological analysis of the thyroid gland.
authors.affiliation: Division of Endocrine Surgery, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Songpa-Gu, Seoul, Korea.
authors.forename: Tae-Yon
authors.initials: TY
authors.lastname: Sung
authors.forename: Sang-Ryung
authors.initials: SR
authors.lastname: Lee
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Yu-mi
authors.initials: YM
authors.lastname: Lee
authors.forename: A-Lan
authors.initials: AL
authors.lastname: Lee
authors.forename: Dae-Wook
authors.initials: DW
authors.lastname: Hwang
authors.forename: Jong Ho
authors.initials: JH
authors.lastname: Yoon
authors.forename: Gyungyub
authors.initials: G
authors.lastname: Gong
authors.forename: Suck Joon
authors.initials: SJ
authors.lastname: Hong
authors.forename: Kwang-Min
authors.initials: KM
authors.lastname: Park
mesh_terms: D006528:Carcinoma, Hepatocellular / Q000000981:diagnostic imaging / Q000556:secondary* / Q000601:surgery; D018276:Carcinoma, Medullary / Q000000981:diagnostic imaging / Q000556:secondary* / Q000601:surgery; D019788:Fluorodeoxyglucose F18; D006651:Histocytochemistry; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography / Q000379:methods; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary* / Q000601:surgery; D014463:Ultrasonography
chemical_list: D019788:Fluorodeoxyglucose F18