节细胞神经瘤的CT和MRI诊断

CT and MRI diagnosis of ganglioneuroma

目的通过分析节细胞神经瘤的影像学表现,提高对该病诊断的准确性。方法回顾性分析17例经手术病理证实的节细胞神经瘤的影像学特点。结果 17例肿瘤中,4例位于纵隔,3例位于肾上腺,7例位于腹膜后间隙,2例位于颈部,1例为纵隔及腹膜后多发;肿瘤最大者约14.9cm×13.5cm×11.2cm;肿瘤边界清楚,其中8例表现为类圆形,9例形态不规则,其中2例呈嵌入性生长。17例CT平扫表现为低密度,低于肌肉密度,8例可见散在点状或小斑块状钙化,T1WI呈低信号,T2WI中高混杂信号;增强扫描一般为条片状不均匀轻中度进行性强化。结论节细胞神经瘤的CT和MRI表现有一定的特征,正确认识其影像表现,可对大多数病例做出正确诊断。

Objective To analyze the CT and MRI findings of ganglioneuroma and to improve the capacity of diagnosis. Methods The CT and MRI features of 17 cases of ganglioneuroma confirmed by surgery and pathology were retrospective ly analyzed. Results Among 17 cases of tumors, 4 cases located in the mediastinum, 3 cases located in the adrenal gland, 7 cases located in the retroperitoneal space, 2 cases located in the neck, 1 case with multiple lesions located in mediastinum and retroperitoneal space. The size of the largest lesion was about 14.9 crux 13.5 cmX 11.2 cm; The border of tumors was clear. 8 lesions presented round shape, and the other lesions were irregular shape. CT scans showed low density of le- sions （below the muscle density） in all cases. The scattered punctate or small massive calcification could be seen in 8 ca- ses. 7 cases undergoing MRI showed low signal in T1WI and heterogeneous high signals in T2WI. Enhanced CT scans showed heterogeneous enhancement in mild to moderate degree and delayed enhancement. Conclusion There were some characteristic CT and MRI findings of ganglioneuroma, which can help make correct diagnosis preoperatively.