King P S, Cooperberg P L, Madigan S M
AJR Am J Roentgenol. 1986 Feb;146(2):345-8. doi: 10.2214/ajr.146.2.345.
In six cases, abdominal aortic aneurysms simulated dissections because an anechoic crescent was seen peripheral to the echogenic intraluminal thrombus. Thrombus can easily be identified by sonography, but the layered echogenic and anechoic appearance has not been described. Three of these cases are presented to illustrate this sonographic pattern of thrombus so that it will not be misinterpreted as a dissection. CT scans were performed on all three patients and an arteriogram and surgery in one, all of which confirmed that these were not dissections but two layers of thrombus with the intima peripheral to the anechoic layer. At surgery, the anechoic layer medial to the intima in one case proved to be serosanguinous fluid and, therefore, likely liquefaction of the clot.
在6例病例中，腹主动脉瘤模拟了夹层动脉瘤，因为在强回声腔内血栓周围可见无回声新月形。血栓可通过超声检查轻易识别，但尚未描述其分层的强回声和无回声表现。现展示其中3例病例以说明这种血栓的超声图像模式，以免被误诊为夹层动脉瘤。所有3例患者均进行了CT扫描，其中1例还进行了动脉造影和手术，所有这些均证实这些并非夹层动脉瘤，而是两层血栓，内膜位于无回声层的外周。在手术中，1例病例中内膜内侧的无回声层被证明是浆液性液体，因此可能是血凝块的液化。
