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目的探讨单纯型卵巢无性细胞瘤的MRI表现。方法回顾性分析6例经手术病理证实的单纯型卵巢无性细胞瘤患者的临床、MRI及病理资料,总结其MRI表现。结果 6例肿块均位于单侧,肿块平均长径15 cm,呈类圆形、类椭圆形及哑铃状,包膜完整、边界清楚。4例为实性肿块伴坏死或囊变,2例为实性为主的囊实性肿块,实性部分T1WI呈等信号、T2WI呈稍高信号,坏死及囊性部分T1WI呈低信号、T2WI呈高信号;T2WI上见低信号纤维间隔将肿块分隔成多发小叶样改变。4例见流空血管影。DWI见实性部分呈高信号。增强扫描实性部分呈渐进性强化,动脉期呈轻度强化,静脉期呈中度强化,平衡期呈持续中度强化,纤维间隔及包膜呈渐进性明显强化。结论单纯型卵巢无性细胞瘤的MRI典型表现为低信号纤维间隔将肿块分隔成多发小叶样改变,结合患者年龄可作出诊断。
Objective To investigate the MRI manifestations of simple ovarian dysgerminoma. Methods The clinical, MRI and pathological data of 6 cases of simple ovarian dysgerminoma confirmed by surgery and pathology were retrospectively analyzed. The MRI findings were summarized. Results All the 6 tumors were located on one side. The average longest diameter of the tumor was 15 cm. The tumors were round, oval and dumbbell-shaped with complete capsule and clear boundary. 4 cases with solid mass with necrosis or cystic change, 2 cases with solid-based cystic mass, solid T1WI was equal signal, T2WI was slightly higher signal, necrosis and cystic T1WI showed low signal, T2WI Showed a high signal; T2WI see low signal fiber interval will be divided into multiple lobular-like changes. 4 cases see empty blood vessels shadow. DWI see the solid part was high signal. The real part of the enhanced scan showed gradual enhancement. The arterial phase showed a slight enhancement, the venous phase was moderately enhanced, the balance phase showed a sustained and moderate enhancement, and the fibrous septum and the envelope were significantly enhanced. Conclusion The typical manifestations of MRI of simple ovarian dysgerminoma are low signal fiber interval, the tumor is divided into multiple leaflet-like changes, combined with the patient’s age can make a diagnosis.