  Close-up view of a frontal radiograph of the chest (A) demonstrates a large mediastinal soft tissue mass (solid white arrow). This soft tissue density represents a large aneurysm of the proximal descending aorta seen also in the CT scan (B). The aneurysm measured 6.7 cm, which placed it at significant risk for rupture. Calcification in the wall of an aneurysm is common (dotted white arrow). Contrast material mixes with blood flowing in the lumen of the aorta (solid white arrow), but the flowing blood is separated from the intimal calcification by a considerable amount of noncontrast-containing thrombus adherent to the wall (closed black arrow). 正位胸片放大图可见纵隔处一巨大软组织肿块。表示升主动脉近心端的巨大动脉瘤，CT平扫也可见。直径约6.7cm，破裂风险很大。瘤壁钙化很常见。对比剂与血液混合残留在主动脉管腔中。但是血流与内膜的钙化，被大量不含造影剂的附壁血栓分离。 Notes intimal /'intəməl/ adj. 内层的、内膜的 来源：每天朗读一段医学影像学英语文章 圈主 深圳市人民医院放射科副主任医师杨敏洁 |
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