多形性黄色星形细胞瘤26例影像表现及文献总结

Imaging features analysis of 26 patients of pleomorphic xanthoastrocytoma and summary of literature

目的 分析多形性黄色星形细胞瘤的CT、MRI表现特征,提高对本病的诊断水平.方法 回顾性分析26例经手术和病理证实的多形性黄色星形细胞瘤患者的影像表现,对病变位置、大小、信号（密度）及瘤周水肿进行影像分析.结果 肿瘤位于右颞叶11例,左颞叶8例,右额叶2例,侧脑室及第三脑室各1例,右枕叶1例,桥脑延髓交界区1例,颈髓1例,肿瘤最大82 mm×40 mm×70 mm,最小16 mm×13 mm×14 mm;肿瘤实性3例、实性伴坏死7例、囊实性16例、肿瘤合并钙化4例;肿瘤实性部分T1WI为等或稍低信号,T2WI呈等或稍高信号,CT为等、高密度;轻度水肿2例,中度水肿5例,重度水肿1例.结论 多形性黄色星形细胞瘤具有独特的影像学特征,通过影像分析可提高对该肿瘤的认识及诊断水平.

Objective To analyse the CT,MRI features of pleomorphic xanthoastrocytoma and improve the diagnosis.Methods Imaging feature of pleomorphic xanthoastrocytoma of 26 cases confirmed by surgery and pathology were analyzed retrospectively.Distribution,size,shape,signal,dense,peritumor edema and invasion of adjacent structures of lesion were summarized.Results The locations of lesions included：temporosphenoid lobe （19 cases）,frontal lobe （2 cases）,the lateral and three ventricles in 1 case,occipital lobe （1 case）,medulla oblongata （1 case）,and cervical cord （1 case）.The tumor size：maximum：82 mm × 40 mm × 70 mm,minimum：16 mm × 13 mm × 14 mm.Solid lesions （3 cases）,solid lesions with necrosis （7 cases）,solid and cystic lesions （16 cases）,lesion with calcification （4 cases）.The solid lesions of the tumors showed equal signal intensity or slightly low signal intensity on T1WI,and equal signal intensity or slightly high signal intensity on T2WI.The equidensite and high density on CT,peritumor edema degree：mild （2 cases）,moderate （5 cases）,severe （1 case）.Conclusion The characteristic imaging features can help in the understanding and diagnosis of pleomorphic xanthoastrocytoma.