后纵隔神经节细胞瘤和神经节神经母细胞瘤的CT和MRI诊断

CT and MRI Diagnosis of Ganglioneuromas and Ganglioneuroblastomas in the Posterior Mediastinum

目的：分析后纵隔神经节细胞瘤和神经节神经母细胞瘤的ＣＴ和ＭＲＩ表现及其诊断。材料和方法：分析经手术、病理证实的神经节细胞瘤７例，神经节神经母细胞瘤２例的ＣＴ和ＭＲＩ表现。结果：肿瘤常呈半圆形或椭圆形，纵径比横径或前后径长，边缘锐利，１例神经节细胞瘤呈哑铃形。ＣＴ示肿瘤实性部分呈等或稍低于胸壁肌密度，囊变部分的密度比脑脊液稍高。Ｔ_１ＷＩ示肿瘤等或稍低于胸壁肌信号，囊变部分稍高于脑脊液的低信号；Ｔ_２ＷＩ呈高信号。结论：肿瘤纵径长于其它径是重要征象，ＣＴ和ＭＲＩ能显示肿瘤形态特征，提示诊断。

Purpose: To analyse CT and MRI features and diagnosis of ganglioneuromas and ganglioneuroblastomas. Materials and Math ods: CT and MRI findings of 7 cases with ganglioneuroma and 2 case with ganglioneuroblastoma proved by operation and pathology were analysed retrospectively. Results: The tumors usually had a semicircular or elliptial shape, with a longer longitudinal diameter than other, aharp margin. One ganglioneuroma had a dumbell shape. On CT there was iso - or slight hypodense in the solid part, hypo-but slight hy perdense than CSF in cystic degeneration. On MRI, there was iso-or slight hypointensity than muscle on T_1WI, hyperintensity, on T_2WI, hypo-but slight hyperintensity than CSF on T_1WI, and hyperintensity on T_2WI in cystic degeneration. Conclusion: The tumor has a longer longitudinal diameter than other that is a important sign. CT and MRI can exhibite the morphologial character and suggest the diagnosis of ganglioneuroma or ganglioneuroblastoma.