Kurosaki Y, Kurosaki A, Irimoto M, Kuramoto K, Itai Y
Department of Radiology, University of Tsukuba, Japan.
J Comput Assist Tomogr. 1993 Nov-Dec;17(6):857-61. doi: 10.1097/00004728-199311000-00004.
The purpose of this study was to evaluate the usefulness of CT in making a diagnosis of systemic arterial supply to normal basal segments of the left lower lobe.
We retrospectively reviewed chest radiography (three cases), CT (three cases), and angiography (two cases).
An anomalous systemic artery arising from the descending aorta was shown as a retrocardiac density on posteroanterior radiography and as a nodular density behind the heart on lateral radiography. Contrast enhanced CT revealed the vascular nature of the density adjacent to the descending aorta. Dynamic CT in one patient demonstrated that the nodular density was composed of an anomalous systemic artery and a prominent inferior pulmonary vein. High-resolution CT showed the interlobar artery distal to the origin of the superior segmental artery to be absent. The bronchial system of the left basal segments was normal as was the pulmonary parenchyma on CT.
Characteristic CT findings consist of absence of the interlobar artery distal to the origin of the superior segmental artery and origination of an anomalous artery from the descending aorta that gives off branches to normal left basal segments. With a constellation of these CT findings, angiography would be obviated for definite diagnosis of this anomaly.
本研究旨在评估CT在诊断左下叶正常基底段的体循环动脉供血方面的实用性。
我们回顾性分析了胸部X线片（3例）、CT（3例）和血管造影（2例）。
降主动脉发出的异常体循环动脉在后前位X线片上表现为心后密度影，在侧位X线片上表现为心脏后方的结节状密度影。增强CT显示降主动脉旁密度影的血管性质。1例患者的动态CT显示结节状密度影由异常体循环动脉和增粗的下肺静脉组成。高分辨率CT显示上段动脉起源远端的叶间动脉缺如。CT上左基底段的支气管系统及肺实质正常。
CT的特征性表现包括上段动脉起源远端的叶间动脉缺如以及降主动脉发出异常动脉并向正常左基底段分支。有了这些CT表现，无需进行血管造影即可明确诊断该异常。
