title: Usefulness of novel imaging modalities in diagnosis of focal nodular hyperplasia of the liver.
abstract: A 17-year-old woman was admitted because of a liver tumor found incidentally by ultrasonography. Liver function was normal and there were no markers of hepatitis viruses or malignancy. Abdominal ultrasonography, computed tomography (CT), and magnetic resonance imaging revealed a mass (2 cm in diameter) in the lateral segment of the left lobe of the liver. The lesion was not detected by hepatic arteriography. However, dynamic CT with fast scanning and dynamic CO2-enhanced ultrasonography demonstrated initial central enhancement of the mass followed by centrifugal spread of enhancement to the periphery. Color Doppler flow imaging detected a central color spot, shown to be an artery by a pulsed Doppler spectrum analysis. Fine-needle biopsy confirmed a diagnosis of focal nodular hyperplasia. Dynamic CT with fast scanning, dynamic CO2-enhanced ultrasonography, and color Doppler flow imaging were useful in detecting the vascular pattern specific to focal nodular hyperplasia. Investigation of further cases with these novel imaging modalities should help to establish a comprehensive diagnostic procedure and thus avoid unnecessary surgery for focal nodular hyperplasia, which is a completely benign lesion.
authors.affiliation: Department of Gastroenterology, Gifu Municipal Hospital, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nishigaki
authors.forename: E
authors.initials: E
authors.lastname: Tomita
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuno
authors.forename: K
authors.initials: K
authors.lastname: Goto
authors.forename: T
authors.initials: T
authors.lastname: Ohnishi
authors.forename: Y
authors.initials: Y
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Iwai
authors.forename: H
authors.initials: H
authors.lastname: Asano
authors.forename: I
authors.initials: I
authors.lastname: Yasuda
authors.forename: K
authors.initials: K
authors.lastname: Nagura
authors.forename: T
authors.initials: T
authors.lastname: Wakahara
authors.forename: T
authors.initials: T
authors.lastname: Yamada
mesh_terms: D000293:Adolescent; D001707:Biopsy, Needle; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000175:diagnosis; D008099:Liver / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D008107:Liver Diseases / Q000175:diagnosis*; D008113:Liver Neoplasms / Q000098:blood supply / Q000175:diagnosis; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed; D018615:Ultrasonography, Doppler, Color