title: A case of liver metastasis from colon cancer masquerading as focal sparing in a fatty liver.
abstract: Focal sparing in diffusely fatty liver is a well recognized entity. However, it occasionally creates some problems in the diagnosis of hepatic mass lesions. We recently experienced a case of liver metastasis from colon cancer which appeared as a wedge-shaped hyperdense area on non-enhanced CT (computed tomography). Other imaging techniques also demonstrated a wedge-shaped area which was difficult to distinguish from mere focal sparing in the fatty liver. CT arteriography and dynamic magnetic resonance images were useful for diagnosing this metastatic tumor. CT during arterial portography showed a wedge-shaped ischemic area in the anterior segment caused by intrahepatic portal vein blockade. The histological findings eventually revealed that the tumor, an adenocarcinoma, was surrounded by fibrotic tissue that mimicked focal sparing. We present the radiological features of this case and discuss how to arrive at a correct diagnosis.
authors.affiliation: Second Department of Surgery, Gifu University School of Medicine, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kato
authors.forename: S
authors.initials: S
authors.lastname: Saji
authors.forename: M
authors.initials: M
authors.lastname: Kanematsu
authors.forename: D
authors.initials: D
authors.lastname: Fukada
authors.forename: K
authors.initials: K
authors.lastname: Miya
authors.forename: T
authors.initials: T
authors.lastname: Umemoto
authors.forename: K
authors.initials: K
authors.lastname: Kunieda
authors.forename: Y
authors.initials: Y
authors.lastname: Sugiyama
authors.forename: I
authors.initials: I
authors.lastname: Kuwahara
authors.forename: K
authors.initials: K
authors.lastname: Shimokawa
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000556:secondary*; D003937:Diagnosis, Differential; D005234:Fatty Liver / Q000000981:diagnostic imaging*; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000556:secondary*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012811:Sigmoid Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed / Q000379:methods