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目的探讨3.0 T磁共振在胃肠道神经内分泌肿瘤诊断中的价值。方法回顾性分析6例经手术后病理证实的胃肠道神经内分泌肿瘤患者的MRI表现,并与病理结果对照。结果 6例患者中病灶均显示管壁增厚,管腔不同程度狭窄,最大病灶大小约6.1 cm×2.6 cm×2.4 cm。MRI主要表现T1WI等信号3例,稍低信号3例;T2WI脂肪抑制表现为等信号2例,稍高信号4例;DWI序列中,6例病灶均为高信号。动态增强扫描,4例病灶动脉期明显强化,其中3例静脉期及延迟期强化减弱,另1例静脉期及延迟期持续强化;2例病灶始终呈轻中度强化。2例发生于胃部病灶及1例发生于直肠的病灶向壁外浸润。结论胃肠道神经内分泌肿瘤多表现为T1WI上等或稍低信号,T2WI上等或稍高信号,DWI扩散受限,动态增强扫描呈“快进快出”表现。MRI对其诊断和鉴别诊断有重要价值。
Objective To investigate the value of 3.0 T magnetic resonance imaging in the diagnosis of gastrointestinal neuroendocrine tumors. Methods The MRI findings of 6 cases of gastrointestinal neuroendocrine tumors proved by pathology were retrospectively analyzed and compared with the pathological results. Results The lesions in all 6 cases showed thickening of the wall and varying degrees of lumen stenosis. The maximum lesion size was about 6.1 cm × 2.6 cm × 2.4 cm. MRI mainly showed T1WI signal in 3 cases and slightly lower signal in 3 cases. In T2WI fat suppression, 2 cases were equal signal and 4 cases were slightly high signal. Among DWI sequences, 6 cases were high signal. Dynamic enhanced scan, 4 cases of lesions were significantly enhanced arterial phase, of which 3 cases of venous phase and delayed weakening, and the other 1 cases of continuous enhancement of the venous phase and delayed; 2 lesions were always mild to moderate enhancement. Two cases occurred in the stomach lesions and one case occurred in the rectum lesions infiltration to the wall. Conclusions Gastrointestinal neuroendocrine tumors mostly showed T1WI superior or slightly lower signal, T2WI superior or slightly higher signal, limited diffusion of DWI, and dynamic enhancement scan showed “fast forward fast”. MRI is of great value in diagnosis and differential diagnosis.