title: MR imaging of renal vein occlusion in dogs.
abstract: OBJECTIVE
  MR findings of renal vein thrombosis are not consistent in the literature. Our goal was to evaluate MR findings of kidneys after renal vein occlusion in dogs.
  
  
  METHODS
  Surgical ligation of renal veins was performed in seven dogs. Of these, five dogs were examined with MRI before surgery, on the day of the renal vein ligation, and on the 1st, 4th, 8th, 15th, and 30th days. The other two dogs underwent nephrectomy on the 4th and 8th days for histopathologic correlation.
  
  
  RESULTS
  On T1-weighted images, corticomedullary differentiation was lost in all dogs by the 15th day. On T2-weighted images, the signal intensity of the renal cortex was significantly decreased beginning on the first day. The kidneys showed no medullary enhancement in the postcontrast period. The volume of the kidney began increasing at the time of renal vein ligation, started to decrease after the 4th day, and developed significant atrophy by the 30th day.
  
  
  CONCLUSIONS
  After renal vein ligation, the renal cortex appears hypointense on T2-weighted images, corticomedullary differentiation is lost within 2 weeks on T1-weighted images, and the kidney becomes atrophic by 1 month.
authors.affiliation: Department of Radiology, Karadeniz Technical University, Farabi Hospital, Trabzon, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Sari
authors.forename: R
authors.initials: R
authors.lastname: Ozyavuz
authors.forename: A
authors.initials: A
authors.lastname: Demirci
authors.forename: C
authors.initials: C
authors.lastname: Ercin
authors.forename: A
authors.initials: A
authors.lastname: Arslan
authors.forename: A K
authors.initials: AK
authors.lastname: Yuzuncu
authors.forename: H R
authors.initials: HR
authors.lastname: Gumele
mesh_terms: D000818:Animals; D003251:Constriction, Pathologic / Q000175:diagnosis; D004285:Dogs; D007668:Kidney / Q000473:pathology*; D007672:Kidney Cortex / Q000473:pathology; D007679:Kidney Medulla / Q000473:pathology; D008279:Magnetic Resonance Imaging; D012082:Renal Veins / Q000473:pathology*; D013997:Time Factors; D020246:Venous Thrombosis / Q000175:diagnosis