title: Postural proteinuria associated with left renal vein entrapment: a follow-up evaluation.
abstract: Imaging studies show entrapment of the left renal vein in the fork between the aorta and proximal superior mesenteric artery in most cases of isolated postural proteinuria. Therefore, it has been postulated that partial obstruction to the flow in the left renal vein in the upright position is a cause of this form of proteinuria. In a girl with isolated postural proteinuria, kidney ultrasonic imaging and Doppler flow scanning showed left renal vein entrapment. Seven years later, a new evaluation showed resolution of both postural proteinuria and left renal vein entrapment. The longitudinal observation provides substantial additional support for entrapment of the left renal vein by the aorta and superior mesenteric artery as a cause of isolated postural proteinuria.
authors.affiliation: Emergency Unit, Clinica Pediatrica De Marchi, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Milan, Italy.
authors.forename: Gregorio P
authors.initials: GP
authors.lastname: Milani
authors.forename: Marta B M
authors.initials: MB
authors.lastname: Mazzoni
authors.forename: Larry
authors.initials: L
authors.lastname: Burdick
authors.forename: Mario G
authors.initials: MG
authors.lastname: Bianchetti
authors.forename: Emilio F
authors.initials: EF
authors.lastname: Fossali
mesh_terms: D001011:Aorta; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017078:Laser-Doppler Flowmetry; D017538:Mesenteric Artery, Superior; D011187:Posture / Q000502:physiology*; D011507:Proteinuria / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D012039:Regional Blood Flow / Q000502:physiology; D012082:Renal Veins / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014463:Ultrasonography; D055815:Young Adult