毛细胞型星形细胞瘤的CT诊断及鉴别诊断

CT diagnosis and differential diagnosis of pilocytic astrocytoma

目的：探讨毛细胞星形细胞瘤CT诊断及鉴别诊断。方法：收集经手术病理证实的毛细胞星形细胞瘤15例。结果：毛细胞星形细胞瘤具有如下CT特点：肿瘤在CT上表现为混杂密度灶，注射对比剂后肿瘤的强化方式可以分为以下五种：非强化性的囊壁及显著强化的壁结节、强化的囊壁及显著强化的壁结节、环形强化的囊壁、实性肿瘤的均匀强化、肿瘤大部分为实性的不均匀强化；肿瘤形态为：不规则分叶状，不伴出血时，瘤周水肿少见或轻微；伴出血时，可见明显水肿；肿瘤多为囊性，囊实性或呈大囊小结节型，可伴出血。结论：毛细胞星形细胞瘤具有一定的特征性，但确诊需要病理检查。

Objective：to investigat the value of CT in the diagnosis and differential diagnosis of pilocytic astrocytoma. Methods：15 patients with pilocytic astrocytoma proved by surgery and pathology. Results：The CT findings of pilocytic astrocytoma were as follows： The tumors appeared mixed density; After contrast injection, the tumors appeared with a nonenhancing cyst wall （only the mural nodule was enhanced） ; cystic tumor with an enhanced cyst wall （the mural nodule and the cyst wall were enhanced） ; cystic tumor with an enhanced cyst wall （only the cyst wall was enhanced） ; solid tumor（regular contrast enhancement） ; mainly solid tumor （most with irregular contrast enhancement）. Conclusion：The CT appearances of the pilocytie astrocytoma are characteristic. But the definite diagnosis depends on pathological biopsy.