小儿腹膜后成神经细胞瘤影像学与病理的对照研究

目的 探讨ＣＴ、ＭＲＩ对小儿腹膜后成神经细胞瘤的诊断价值和限度。方法 对３２例中２０例术前同时行ＭＲＩ、ＣＴ检查者与术中所见对照，并对其中１９例术后离体肿瘤的ＭＲＩ、ＣＴ影像与病理大切片对照。结果 ＭＲＩ表现一般为Ｔ１Ｗ１中低信号，Ｔ２Ｗ１明显高信号，且可见低信号网格及肿瘤对血管的包绕。组织学基础：原始成神经细胞核大密集，无间质；瘤巢周围有神经纤维。ＣＴ表现肿瘤为不均匀低密度，可见钙化。术前判断肿

Imaging diagnosis of retroperitoneal neuroblastoma in children with pathologiccorrelation

Objective To evaluate the value and limitation of computer tomography and magnetic resonance imaging in the diagnosis of retroperitoneal neuroblastoma in children Methods Thirty two cases of retroperitoneal neuroblastoma in which 20 cases under went both CT and MR imaging before resection were reported In 19 cases MRI and CT of the gross specimens were correlated with histopathologic examination and also with the images before resection Results The MRI features of the tumor were hypointense on T 1WI and very hyperintense on T 2WI with hypointense net like strands scattered inside the tumor mass Vessels were usually invaded and encased by the tumor when the tumor was large CT features showed in homogeneous mass with high nuclear plasmic ratio, without or very scanty stroma The tumor nest was surrounded by thick neural fibrils Comparison of MRI and CT in diagnosis: assessment of the presence of tumer mass, CT=MRI; assessment of location of tumor, MRI>CT in 3 cases;assessment of degree of progression , MRI>CT in 3 cases; assessment of invasion of vasculature(15 cases), in which MRI>CT in 9 Conclusion MRI plays a more important role in characterization of retroperitoneal neuroblastoma in children than CT