目的分析儿童胸膜肺母细胞瘤 (PPB)的CT图像特点。方法 收集我院5例 经针刺活检、手术病理确诊为PPB患儿 的临床资料，所选患儿均行CT扫描，对 其CT特点进行回顾性分析。结果 本组5 例均为单发，肿瘤位于右侧3例、左侧2 例，Ⅱ型4例、Ⅲ型1例；CT平扫显示胸 膜下团块状、不规则状或占据整个胸腔 的巨大肿块。Ⅱ型密度不均匀，病灶中 心可见液化坏死的低密度区，增强扫描 实性成分轻-中度不均匀强化，囊性成分 及液化坏死无强化。Ⅲ型密度较均匀， 增强扫描呈中度不均匀强化；病灶较大 时压迫肺组织及纵隔，纵隔未见肿大淋 巴结，相邻肋骨未见骨质破坏。结论 儿 童PPB发病率极低，恶性程度高，其CT表 现缺乏特异性，确诊本病需依赖病理及 免疫组化。

Objective To analyze the CT image characteristics of children's pleural pulmonary blastoma (PPB). Methods Clinical data of 5 patients with needle biopsy and surgical pathology were collected in our hospital. The CT scan was performed and the CT features were analyzed retrospectively. Results There were 5 cases in total, 3 cases located at left lung and 2 located at right lung, type Ⅱ 4 cases, Ⅲ type 1 case; CT scans revealed massive lumps, irregular shapes, or large lumps occupying the entire chest. Ⅱ type inhomogeneous density, liquefied necrotic lesions center visible low density area, enhanced scan solid part of uneven light to moderate strengthening, liquefied necrotic cystic part and without reinforcement. Type Ⅲ density is uniform, enhanced scan in moderate reinforced uneven; When the lesion was large, the lung tissue and mediastinum were suppressed, and the enlarged lymph nodes were not seen, and bone destruction was not seen in adjacent ribs. Conclusion The incidence of PPB in children is low, the degree of malignancy is high, and its CT performance is lack of specificity. The diagnosis of this disease depends on pathological and immunohistochemistry.