Objective To study the differentiation dignosis between benign and malignant thyroid nodules by MRI. Methods MR] findinds of eighteen cases of thyroid carcinoma and thirty-two benign thyroid nodules were analyzed retrospectively with post surgical pathological findings. Results Both groups showed no statistically significant differences in age, gender ratio, cystic findings and the pattern of enhancement (P>0. 05). However, the significant differences were found in number of nodules, appearance and boundary of thyroid nodules (whether accompanied with diffusely enlarged mass) (P<0. 05). Besides this, all of the benign nodules were outlined with complete pcritumoral low signal intensity. Incomplete outline and partial convexity of nodules were only seen in thyroid carcinoma. Conclusion The complete pcritumoral low signal intensity "capsule-like" sign is an important MRI feature to differentiate benign thyroid nodule from malignant. However, other imaging features also should keep on mind while making the decision.%目的 探讨MRI在甲状腺结节良恶性鉴别诊断中的应用价值.方法 回顾性分析18例甲状腺癌和32例甲状腺良性结节的术前MRI表现,并与术后病理进行对比研究.结果 甲状腺良恶性结节在发病年龄、性别比例方面,结节是否伴有囊变及强化方式方面无显著性差异(P>0.05); 两者在结节的数目、形态、边界以及是否伴有甲状腺弥漫性肿大方面具有显著性差异(P<0.05); 此外,结节周围出现完整的假包膜者均为良性,而该低信号影不完整并局部外突者均为甲状腺癌.结论 结节周围完整的假包膜对于鉴别甲状腺结节良恶性具有重要价值;综合分析MRI的各种征象有助于术前的正确诊断.
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