值得注意的急性肺动脉栓塞平扫CT征象

目的描述能提示急性肺动脉栓塞的CT平扫征象。方法回顾性分析49例经临床治疗证实的急性肺动脉栓塞病例的螺旋CT影像，发现能提示急性肺动脉栓塞的平扫异常征象。结果在49例平扫影像中，共有10例出现肺动脉密度改变，其中局限性密度增高6例，局限性密度减低4例。结论急性肺动脉栓塞的确诊需要行CT增强扫描，但对于不能使用对比剂或因非典型心肺症状而仅作平扫的病例，肺动脉CT平扫的异常密度改变能提示急性肺动脉栓塞的存在。

Acute pulmonary embolism:some noticeable unenhanced CT imaging signs

Objective To describe some unenhanced spiral CT imaging signs that can clue to acute pulmonary embolism.Methods By retrospectively analyzing spiral CT imaging of acute pulmonary embolism proved by clinical treatment in 49 cases, some noticeable abnormal imaging signs were found.Results Among the 49 cases, 10 cases had abnormal attenuation changes in the pulmonary arteries, 6 of them had local high-attenuation centrally and 4 of them had local low-attenuation centrally.Conclusion The final diagnosis of acute pulmonary embolism depends on enhanced CT scan.But for cases that they could not use contrast media or cases that they only underwent unenhanced CT because of nonspecific heart-pulmonary symptom, abnormal attenuation changes of pulmonary arteries can clue to acute pulmonary embolism.