title: CT depiction of portal vein thrombi after creation of ileal pouch-anal anastomosis.
abstract: OBJECTIVE
  To determine the presence and location of portal vein thrombi in patients who have undergone ileal pouch-anal anastomosis (IPAA) and who were scanned with computed tomography (CT).
  
  
  METHODS
  During a 4-year period, 92 of 702 patients underwent contrast medium-enhanced CT after a total proctocolectomy with an IPAA. These CT scans were retrospectively reviewed for portal vein thrombus presence, location, and occlusive nature, as well as any accompanying enhancement abnormalities of the hepatic parenchyma. Only 13 patients who had initial CT scans that were positive for thrombi underwent follow-up examinations, and these were reviewed for resolution or progression of the original findings.
  
  
  RESULTS
  Portal vein thrombi were present in 41 (45%) of the 92 patients; 24 (59%) of the 41 were isolated, often multiple, segmental right lobe thrombi. Five patients had both right and left segmental vein involvement. Eleven patients had various combinations of main portal vein, right and left portal vein, or segmental vein thrombi. One patient had an isolated superior mesenteric vein thrombus. Twenty-two of 25 superior mesenteric vein, main portal vein, and right and left portal vein thrombi were nonocclusive, while most (63 of 86) of the segmental vein thrombi were occlusive. Wedge-shaped, peripheral areas of hepatic parenchymal hyperenhancement that were distal to the thrombi were present in 30 (73%) of the 41 patients. Follow-up scans obtained in the 13 patients with portal vein thrombi showed thrombi resolved in five patients, progression to cavernous transformation occurred in one patient, and parenchymal enhancement changes persisted in seven patients. In the seven patients with persistent enhancement changes, four had complete resolution of thrombi.
  
  
  CONCLUSIONS
  Portal vein thrombi appear to be relatively common after IPAA surgery and are most likely segmental, multiple, and occlusive. Peripheral wedge-shaped areas of hepatic parenchymal hyperenhancement commonly accompany these thrombi.
authors.affiliation: Department of Radiology, Cleveland Clinic Foundation, 9500 Euclid Ave, Cleveland, OH 44195, USA. bakerm@ccf.org
authors.forename: Mark E
authors.initials: ME
authors.lastname: Baker
authors.forename: Feza
authors.initials: F
authors.lastname: Remzi
authors.forename: David
authors.initials: D
authors.lastname: Einstein
authors.forename: Mustafa
authors.initials: M
authors.lastname: Oncel
authors.forename: Brian
authors.initials: B
authors.lastname: Herts
authors.forename: Erick
authors.initials: E
authors.lastname: Remer
authors.forename: Victor
authors.initials: V
authors.lastname: Fazio
mesh_terms: D000293:Adolescent; D000328:Adult; D001003:Anal Canal / Q000601:surgery*; D000714:Anastomosis, Surgical; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007082:Ileum / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011169:Portal Vein; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D020246:Venous Thrombosis / Q000000981:diagnostic imaging*