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

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.T1WI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;T2WI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.

CT and MRI Diagnosis of Ganglioneuromas andGanglioneuroblastomas in the Posterior Mediastinum

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.