目的 分析弥漫性星形细胞瘤MRI 及CT影像学特征，总结其诊断价值。方 法 回顾性分析2011年6月-2015年5年于我 院经手术及病理证实为弥漫性星形细胞瘤 的36例患者的临床资料，分析其CT、MRI 表现与特点，与病理对照，评估MRI、CT 联合诊断价值。结果 病理分级：Ⅱ级13 例，Ⅲ级12例，Ⅳ级8例；病灶最大直径 2.1-8.2cm，平均(4.5±0.2)cm。；2例病 变位幕下，34例位于幕上，以其额叶、颞 叶病变多见；大部分可见边界不清、弥漫 性异常信号灶；19例周围均无水肿，未 见显著占位效应，仅12例可见轻中度脑 水肿，5例可见侧脑室受压、中线结构移 位。T1WI序列呈等低信号，T2WI序列呈高 信号，CT扫描可见肿瘤边界模糊低密度 灶；17例未见明显强化，15有轻中度强化 表现，可见结节、小斑块状或非规则环状 强化。结论 弥漫性星形细胞瘤以青年常 见，影像学表现有其特殊性，采用MRI联 合CT检查，可实现多方位、多角度成像扫 查，有助于其鉴别诊断。

Objective To analyze the imaging findings of MRI and CT of diffuse astrocytoma and to summarize the diagnostic value. Methods The clinical data of 36 patients with diffuse astrocytoma confirmed by operation and pathology in our hospital from June 2011 to May 2015 were retrospectively analyzed. The findings and characteristics of CT and MRI were analyzed and compared with pathology. The combined diagnostic value of MRI and CT was evaluated. Results Pathological grading showed that there were 13 cases of grade II, 12 cases of grade III and 8 cases of grade Ⅳ. The maximum diameter of the lesions was 2.1-8.2cm, (4.5±0.2) cm in average. 2 cases of lesions were infratentorial ones and 34 cases were supratentorial ones. Most of the lesions were in frontal lobe and temporal lobe. There were visible lesions with unclear boundaries and diffuse abnormal signals in most of them; There was no edema around 19 cases and no significant mass effect. Only 12 cases were with mild to moderate cerebral edema and 5 cases were with lateral ventricle compression and midline structure translocation. T1WI sequence showed low signal and T2WI sequence showed high signal. CT scan showed that there were tumors with fuzzy boundaries and low density lesions. 17 cases had no obvious enhancement and 15 cases showed moderate enhancement, with visible nodules, small patchy or irregular ring enhancement. Conclusion Diffuse astrocytoma is common in young people. The imaging findings were particular. To adopt MRI and CT combined examination can achieve scan the multidimensional and multiangle imaging scan. It is helpful for the differential diagnosis.