甲状腺癌的CT和MRI诊断

评价ＣＴ和ＭＲＩ对甲状腺癌的诊断价值。材料和方法：回顾分析临床、病理证实的５０例甲状腺癌：３８例进行ＣＴ扫描，２８例作ＭＲＩ检查，其中１６例兼作ＣＴ和ＭＲＩ检查。结果：肿瘤内出血６例（１２％）、相邻结构受侵１１例（２２％）、颈部淋巴结转移１５例（３０％）、甲状腺内囊变２６例（５２％）和钙化２４例（４８％），对甲状腺的定性诊断有重要价值。ＣＴ对甲状腺癌内钙化的发现明显优于ＭＲＩ，对肿瘤侵犯相邻结构的显示与ＭＲＩ相仿。ＭＲＩ对肿瘤内囊变，出血和颈部淋巴结转移的发现优于ＣＴ。结论：在甲状腺癌的定性诊断上，ＭＲＩ优于ＣＴ，但若能将两者相结合，能更准确地作出甲状腺癌的诊断。

Diagnosis of Thyroid Carcinoma with CT and MRI

To assess the diagnostic value of CT and MRI in the diagnosis of thyroid carcinoma. Materials and Methods: Fifty cases of thyroid carcinoma were proved by pathology. Among 50 cases, 16 cases had both CT and MRI examination, and 22 and 12 cases only had CT or MRI studies respecticely. Results: Bleeding of tumor (6 cases, 12%), infiltration of adjacent structures (11 cases, 22%) and metastasis of cervical lymph nodes (15 cases, 30%) were helpful for the characteristic diagnosis of thyroid carcinoma. Cystic change (26 cases, 52%) and calcifiation (24 cases, 48%) inside the tumor were of no significance for differentiation between malignant and benign tumors. CT scan is superior to MRI in detecting calcification. MRI is superior to CT in detecting cystic degeneration, bleeding and cervical lymph nodes metastasis. The capability of detection of adjacent structure infiltration of CT and MRI were similar. Conclusion: In the diagnosis of thyroid carcinoma, MRI is superior to CT. but combination of CT and MRI is more accurate.