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作 者:唐为卿[1] 乐维婕[1] 王平仲[1] 石慧敏[1] 余强[1]
机构地区:[1]上海交通大学医学院附属第九人民医院口腔医学院放射科上海市口腔医学研究所上海市口腔医学重点实验室,200011
出 处:《中华口腔医学杂志》2013年第12期711-715,共5页Chinese Journal of Stomatology
摘 要:目的 总结咀嚼肌间隙软组织病变的动态增强MRI表现特点,并评价其诊断价值.方法 回顾分析53例咀嚼肌间隙软组织病变(均经手术病理证实)的常规MRI和动态增强影像资料.53例中,女性26例、男性27例,平均年龄为35.6岁.计算所有病变的强化达峰时间,相对最大强化率和相对流出率.结果 恶性病变的平均强化达峰时间为(69.6±6.9)s,良性病变的平均强化达峰时间为(130.3±13.2)s;恶性病变的平均相对流出率为(8.7±2.1)%,良性病变的平均相对流出率为(29.7±5.5)%.相比良性病变,恶性病变具有较快的强化达峰时间(P =0.001)和较低的相对流出率(P =0.003).当强化达峰时间<92.2 s和相对流出率≤16.0%被视为恶性肿瘤时,动态增强MRI鉴别良性和恶性病变的敏感性、特异性、准确性、阳性预测值和阴性预测值分别可达到72.3%、93.5%、84.9%、88.9%和82.9%.结论 动态增强MRI对咀嚼肌间隙软组织良性病变和恶性肿瘤的鉴别具有一定价值.Objective To determine the characteristics and diagnostic value of dynamic contrast enhanced MRI(DCE-MRI) in differentiating benign soft tissue lesions from malignant tumors affecting the masticator space(MS).Methods Prior to managements,conventional MRI and DCE-MRI were performed in 53 patients who suffered from primary or secondary soft tissue lesions affecting the MS.The time to peak (TTP),relative maximum enhancement (RME) and relative washout ratio (RWO) were separately calculated.Results Mean TTP of benign and malignant lesions were (130.3 ± 13.2) and (69.6 ± 6.9) s,respectively.Mean RWO of benign and malignant lesions were (29.7 ± 5.5) % and (8.7 ± 2.1) %,respectively.Malignant lesions had a significantly shorter TTP(P =0.001) and lower RWO (P =O.003) than benign lesions.When TTP was less than 92.2 s and RWO less than or equal to 16.0%,malignant tumors were considered.DCE-MRI had a sensitivity of 72.3%,specificity of 93.5%,accuracy of 84.9%,positive predictive value of 88.9%,and negative predictive value of 82.9%.Conclusions As a noninvasive imaging technique,DCE-MRI is valuable to differentiate benign soft tissue lesions from malignant tumors affecting the MS.
分 类 号:R445.2[医药卫生—影像医学与核医学]
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