title: Communicating vein between the left renal vein and left ascending lumber vein: incidence and significance on abdominal CT.
abstract: OBJECTIVE
  To examine the incidence and appearance of the communicating vein between the left renal vein (LRV) and the left ascending lumbar vein (LALV) on abdominal CT.
  
  
  METHODS
  We reviewed the appearance of the communicating vein on contrast-enhanced CT obtained by multidetector-row CT (MDCT) scanner. One hundred patients without known abnormality in this region were randomly chosen and the following findings were recorded: (1) presence or absence of the visible communicating vein, (2) diameter of the communicating vein, (3) visible length of the vein (none, partial, or total), (4) laterality of the ascending lumbar vein, (5) distance between the superior mesenteric artery and the aorta.
  
  
  RESULTS
  The communicating vein was visible in 35 patients (35%). In 20 cases, this vein was visualized within the paraaortic region and could not be traced toward the LALV. The distance between the superior mesenteric artery and the aorta was narrower in the patients with visible communicating vein than in those without it, however, no statistically significant difference was demonstrated.
  
  
  CONCLUSIONS
  This vein is commonly visible in the general population, and care should be taken not to confuse it with lymphadenopathy because this communicating vein was partially visualized within the paraaortic region in 20% of the cases.
authors.affiliation: Department of Radiology, International Catholic Hospital, Tokyo 161-8521, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yao
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Okada
authors.forename: Minoru
authors.initials: M
authors.lastname: Yamato
authors.forename: Kuni
authors.initials: K
authors.lastname: Ohtomo
mesh_terms: D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D015994:Incidence; D008161:Lumbosacral Region; D008206:Lymphatic Diseases / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D012082:Renal Veins / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*