title: Precaution against postoperative venous complications after major hepatectomy using the pedicled omental transposition flap: Report of two cases.
abstract: BACKGROUND
  Vascular complications following hepato-pancreatic biliary surgery can be devastating, and therefore precaution of them must be critical. We report two cases in which the pedicled omental transposition flap might be effective to avoid postoperative venous complications following major hepatectomy.
  
  
  METHODS
  Case 1 is a 80-year-old male who required to perform re-laparotomy at postoperative day 1 following major hepatectomy due to acute portal venous thrombosis (PVT). In the second surgery, the main trunk of PV was occluded by thrombus resulted from its redundancy and kinking. PV was resected with an adequate length and reconstructed. The omental flap was placed between PV and inferior vena cava (IVC) to fill in the dead space, resulting in favorable intrahepatic portal blood flow. Case 2 is a 64-year-old male who underwent left trisectionectomy because of giant hepatocellular carcinoma located close to the trunk of right hepatic vein (RHV) and IVC. After removal of the specimens, the dead space developed between the RHV and IVC. In order to prevent outflow block caused by kinking of the RHV, the omental flap was placed between the RHV and IVC, and the right triangle ligament of the liver was fixed to the diaphragm. RHV patency was confirmed by postoperative imaging.
  
  
  CONCLUSIONS
  The omental flap is a simple procedure and useful to fill the dead space developed in the area surrounding major vessels.
  
  
  CONCLUSIONS
  We experienced two cases in which vascular complications might be avoided by filling the dead space surrounding major vessels using the omental flap.
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan. Electronic address: narinari@kuhp.kyoto-u.ac.jp.
authors.forename: Masato
authors.initials: M
authors.lastname: Narita
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Matsusue
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Hata
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan.
authors.forename: Tetsushi
authors.initials: T
authors.lastname: Otani
authors.affiliation: Department of Surgery, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan.
authors.forename: Iwao
authors.initials: I
authors.lastname: Ikai
keywords: Chemotherapy; Hepatocellular carcinoma; Liver resection; Morbidity; Mortality; Outflow block