The condition of partial anomalous origin of a branch pulmonary artery from the descending aorta could be found in several diseases and should be carefully differentiated. We report an unusual case of anomalous systemic arterial supply to normal basal segments of the left lower lung and another case of intralobar pulmonary sequestration. These two cases were treated successfully by transarterial embolisation using the Amplatzer Vascular Plug. We also set up a diagnostic algorithm to differentiate these diseases from anomalous systemic arterial supply to the pulmonary region. It is possible to make the correct diagnosis using the step-by-step diagnostic algorithm and careful interpretation of chest computed tomography angiography.

来自降主动脉的肺动脉分支部分异常起源的情况可见于多种疾病，应仔细鉴别。我们报告了一例左下肺正常基底段全身动脉供应异常的异常病例和另一例叶内肺隔离症病例。使用 Amplatzer Vascular Plug 经动脉栓塞成功治疗了这两个病例。我们还建立了一种诊断算法，以区分这些疾病与肺部区域的异常全身动脉供应。使用逐步诊断算法和仔细解释胸部计算机断层扫描血管造影可以做出正确诊断。