Sheporaitis L, Freeny P C
Department of Radiology, University of Washington School of Medicine, Seattle 98195, USA.
AJR Am J Roentgenol. 1998 Dec;171(6):1559-64. doi: 10.2214/ajr.171.6.9843288.
The objective of this paper is to describe a new finding on CT of hepatic and portal vein segments located in a subcapsular location on the surface of the liver.
From a series of more than 11,000 contrast-enhanced abdominal CT scans performed from 1993 to 1997, 14 patients were identified as having hepatic or portal vein segments or both in a subcapsular location on the surface of the liver.
We found seven portal vein surface segments in seven patients and 14 hepatic vein surface segments in 12 patients. Of the 14 patients, five had both portal and hepatic vein surface segments. Therefore, in a cohort that exceeded 11,000 patients, the incidence of this finding was 0.1%. Four patients had cirrhosis, two had small hypervascular liver lesions, and eight had healthy livers. The surface veins were not associated with any other recognized vascular anomalies or with anastomoses to extrahepatic systemic veins.
Hepatic and portal veins can course to a subcapsular location on the surface of the liver. This anatomy is believed to be a normal variant and can be found in patients with healthy livers and normal hepatic vein hemodynamics and in patients with portal hypertension.
本文旨在描述肝脏表面包膜下位置的肝静脉和门静脉段在CT上的一项新发现。
在1993年至1997年期间进行的11000余例腹部增强CT扫描中，确定有14例患者肝脏表面包膜下位置存在肝静脉段或门静脉段或两者皆有。
我们在7例患者中发现了7个门静脉表面段，在12例患者中发现了14个肝静脉表面段。14例患者中，5例同时存在门静脉和肝静脉表面段。因此，在超过11000例患者的队列中，这一发现的发生率为0.1%。4例患者患有肝硬化，2例有小的高血供肝脏病变，8例肝脏健康。这些表面静脉与任何其他公认的血管异常或与肝外体静脉的吻合无关。
肝静脉和门静脉可走行至肝脏表面的包膜下位置。这种解剖结构被认为是一种正常变异，可在肝脏健康、肝静脉血流动力学正常的患者以及门静脉高压患者中发现。
