title: Agenesis of the horizontal segment of the left portal vein demonstrated by magnetic resonance imaging including phase-contrast magnetic resonance venography.
abstract: Two cases of agenesis of the horizontal segment of the left portal vein are reported. This very rare vascular anomaly probably corresponds to an embryological variation rather than to an obstruction of the left portal vein. In almost all cases liver ultrasonography is sufficient for identifying such vascular abnormalities. It shows a large aberrant vessel emerging from a right anterior segmental portal branch and running transversely in the quadrate lobe towards the teres ligamentum from which the portal supply to the left lobe arises. It is important to be able to recognize the magnetic resonance imaging features of this vascular variation, as magnetic resonance imaging may be the initial imaging study, and ultrasound may be technically challenging. To our knowledge, we present the first description of these features, including an enhanced gradient-echo T1-weighted sequence, a turbo spin-echo T2-weighted sequence with fat saturation, and a three-dimensional phase-contrast magnetic resonance portography.
authors.affiliation: Department of Radiology, Centre Hospitalier Régional et Universitaire de Nice, Hôpital Archet II, 151 route de Saint Antoine de Ginestière, B.P 3079, F-06202 Nice Cedex 3, France.
authors.forename: P
authors.initials: P
authors.lastname: Chevallier
authors.forename: F
authors.initials: F
authors.lastname: Oddo
authors.forename: E
authors.initials: E
authors.lastname: Baldini
authors.forename: E P
authors.initials: EP
authors.lastname: Peten
authors.forename: B
authors.initials: B
authors.lastname: Diaine
authors.forename: B
authors.initials: B
authors.lastname: Padovani
mesh_terms: D000328:Adult; D000013:Congenital Abnormalities / Q000175:diagnosis / Q000473:pathology; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D011169:Portal Vein / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology; D014463:Ultrasonography