%0 Case Reports
%T Case of Isolated Absence of the Azygos Vein: Evaluation Using Photon-counting Detector CT.
%A Kameda S
%A Ichikawa T
%A Kawada S
%A Nagafuji Y
%A Togawa K
%A Ishii M
%A Iwata K
%A Kobayashi M
%A Machida H
%A Hashimoto J
%J Tokai J Exp Clin Med
%V 49
%N 2
%D 2024 Jul 20
%M 38904236
暂无%X The isolated absence of the azygos vein was incidentally found on computed tomography (CT) examination in a 60-year-old female. The exact anomaly can be evaluated on high-resolution images of 0.4-mm slice thickness with low keV using photon-counting detector CT. The azygos vein, including the azygos arch, was absent, and a mildly dilated hemiazygos vein flowed to the left brachiocephalic vein through the left superior intercostal vein. A hemiazygos vein connected the left renal vein at the level of the first lumbar vertebra. This patient was the second patient to undergo evaluation using volume rendering images. High-resolution maximum-intensity projection images were useful for assessing the anatomy. Radiation dose was decreased compared with that in conventional CT.