Absent middle hepatic vein in a right liver graft donor

摘要： BACKGROUND:The middle hepatic vein(MHV)is normally in form of a large trunk lying within the midplane of the liver.An anomaly in form of two separate trunks, each draining segmentⅤ/Ⅷand segmentⅣ,has been described by Couinaud but not been well documented in the literature. METHOD:We report a right liver donor in whom the MHV was absent and not encountered during liver transection along the midplane of the liver. RESULTS:On computed tomography(CT)scan and intraoperative ultrasonography,there was a large segment Ⅷhepatic vein mistaken as the MHV on preoperative assessment and a large segmentⅣhepatic vein close to the ligamentum venosum.CT volumetry based on either segmentⅧorⅣhepatic vein led to major error in liver volume calculation.Transection of the liver guided by segmentⅧorⅣhepatic vein would lead to sacrifice of liver parenchyma unnecessarily or presence of necrotic liver in the graft. CONCLUSION:Absent MHV is a rare anomaly.It is revealed by careful study of the CT scan. ... （共3頁(yè)）