Minami M, Noda M, Kawauchi N, Shirouzu I, Nakajima J, Araki T, Maehara T, Sasaki Y
Department of Radiology, University of Tokyo Hospital, Japan.
Clin Radiol. 1993 Jul;48(1):52-6. doi: 10.1016/s0009-9260(05)80109-6.
Postaortic left innominate vein (PALIV) is a rare venous anomaly and the findings on plain chest radiographs have not been well described. Plain chest radiographs, CT and MR of nine adults known to have PALIV were reviewed. They all showed a high aortic arch, including four with a right-sided aortic arch and one with a double aortic arch, in postero-anterior radiographs, and seven showed curved shadows in the left upper mediastinum. On all lateral chest radiographs (n = 5), the superior retrosternal region was opacified by the high aortic arch. CT or MR images confirmed the aortic arch and/or innominate artery to be in that part of the retrosternal space, normally occupied by the left innominate vein, in all cases. Association of a curved shadow in the superior mediastinum with a high aortic arch on plain chest radiographs is therefore suggestive of, though not diagnostic for, PALIV. This entity was well documented by CT or MR and the radiological findings were considered to imply that developmentally PALIV is secondary to a high position of the aortic arch.
主动脉后左无名静脉（PALIV）是一种罕见的静脉异常，胸部平片上的表现尚未得到充分描述。回顾了9例已知患有PALIV的成人的胸部平片、CT和MR检查结果。在后前位胸片上，他们均显示主动脉弓高位，其中4例为右侧主动脉弓，1例为双主动脉弓，7例在左上纵隔可见弧形阴影。在所有侧位胸片（n = 5）上，胸骨后上区因主动脉弓高位而呈致密影。CT或MR图像在所有病例中均证实主动脉弓和/或无名动脉位于胸骨后间隙的该部分，该部位通常由左无名静脉占据。因此，胸部平片上纵隔上部的弧形阴影与主动脉弓高位相关，虽不能确诊，但提示可能为PALIV。CT或MR对此病变有很好的显示，影像学表现被认为提示PALIV在发育上继发于主动脉弓高位。
