Gokan T, Hashimoto T, Matsui S, Kushihashi T, Nobusawa H, Munechika H
Department of Radiology, Showa University School of Medicine, Tokyo, Japan.
J Comput Assist Tomogr. 2001 Jan-Feb;25(1):68-73. doi: 10.1097/00004728-200101000-00012.
The purpose of this work was to demonstrate the appearance of the right inferior phrenic artery (RIPA) on CT in patients with hepatocellular carcinoma (HCC).
We assessed the biphasic helical CT scans using 10 mm collimation in 16 patients with arteriographically proven HCCs supplied by the RIPAs. Size of the right and left inferior phrenic arteries and origin of the RIPA were evaluated and correlated with arteriographic images.
Helical CT showed dilated RIPAs on the right diaphragmatic crus as foci of high attenuation on arterial-phase images in all patients. Diameter of the RIPA (average 3.3 mm) was larger than that of the left inferior phrenic artery (average 1.5 mm). The origin of the RIPAs was correctly predicted in 13 of 16 (celiac artery 6, abdominal aorta 5, right renal artery 2) patients.
Asymmetric dilatation of the RIPA as an indicator of extrahepatic collateral of HCC can be demonstrated on the right diaphragmatic crus with arteriographic images of biphasic helical CT.
本研究旨在展示肝细胞癌（HCC）患者右膈下动脉（RIPA）在CT上的表现。
我们对16例经动脉造影证实由RIPA供血的HCC患者进行了10mm层厚的双期螺旋CT扫描。评估了左右膈下动脉的大小以及RIPA的起源，并与动脉造影图像进行对比。
螺旋CT显示，所有患者右侧膈脚处的RIPA在动脉期图像上呈高密度灶，表现为扩张。RIPA的直径（平均3.3mm）大于左膈下动脉（平均1.5mm）。16例患者中有13例（腹腔干6例、腹主动脉5例、右肾动脉2例）RIPA的起源被正确预测。
通过双期螺旋CT动脉造影图像可显示右侧膈脚处RIPA不对称扩张，作为HCC肝外侧支循环的指标。
