甲状腺癌的影像学研究进展

Advances in imaging diagnosis of thyroid carcinoma

X射线、CT、MRI、超声及核素显像是目前甲状腺癌主要的影像学诊断方法。通过复习近年来的文献,对各种方法做了比较后认为：每种影像学检查方法均有各自的优点,同时也存在各自的局限性,因此临床要根据患者的实际情况有目的地选择检查方法。

X-ray, CT, MRI, ultrasonography and scintigraphy are major imaging examining methods in the diagnosis thyroid carcinoma. X-CT： The malignant lesion can be low density with irregular shape and ill-defined margin. It is always used to define the scale of the tumor and the metastasis of lymph node. MRI： On T1-weighted image the signal of malignant lesion is similar with normal thyroid, on T2-weighted image the signal is high intensity. MRS is a feasible technique for the evaluation of malignant thyroid tumors. Uhrasonography： Thyroid carcinoma manifests as a hypoecho nodule with irregular contour, ill- defined margin, microcalcification, without halo. Invasion of adjacent tissue or lymph node metastasis are common. On color Doppler flow imaging intranodular blood flow is valuable. Scintigraphy： The commonly used drug are ^131 I, ^201T1, ^99m Tc-MIBI, ^99m Tc（V）-DMSA, ^111 In-octreotide. PET/CT seems to be helpful in the follow-up of thyroid carcinoma with suspected recurrence and （or） metastases. In this review, recent literatures were reviewed and acomparence was made. Then we found that every method had its advantage as well as its disadvantage, so clinic select proper methods according patient instance.