目 的 分析纵隔支气管囊肿 (mediastinal bronchogenic cyst，MBC) 的CT表现，提高对本病的认识和影像诊 断水平。方法 回顾性分析经手术病理证 实的20例MBC的CT图像，其中15例行增强 扫描。结果 囊肿位于中纵隔9例(右侧7 例)，前纵隔6例(左侧4例)，后纵隔5例 (左侧4例)。肿块大小约3.0cm×1.8cm11.5cm×10.5cm。CT平扫多表现为圆形或 类圆形肿块，边界清晰，密度均匀，增强 扫描无强化。结论 纵隔支气管囊肿CT表 现有一定特点，当发现右侧中纵隔或左侧 前、后纵隔，单发均匀密度肿块、边界清 晰、增强扫描无强化，应该考虑到该病可 能。

Objective To analyze the CT findings of mediastinal bronchogenic cyst(MBC) in order to make a further understanding of its imaging features. Methods CT images in 20 patients with pathologically-proved MBC were retrospectively reviewed. Plain CT scan was performed in 18 patients. Enhancement CT scan was carried out in 15 patients. Results Nine patients had lesions in middle mediastinum(7 lesions on the right). Six patients had lesions in anterior mediastinum(4 lesions on the left), 5 others in posterior mediastinum(4 lesions on the left). The lesion's size ranged from 3.0cm×1.8cm to 11.5cm×10.5cm. All of the lesions were found as a solitary, oval or rounded and well-defined mass. Conclusion CT findings of MBC have some certain characteristics, especially a soft-tissue and well-defined mass, in right middle mediastinum and left anterior or posterior mediastinum, and non-enhancement on contrast CT. MBC should be included in the differential diagnosis of regional tumors.