2Juan Rosai. Rosai and Ackerman's Surgical Pathology. Mosby, 2004:515 -541.
3Rago T, Vitti P, Chovato L, et al. Role of conventional ultrasonography and color flow Doppler sonography in predicting malignancy in " cold" thyroid nodules. European Journal of Endocrinology, 1998,138(1) :41-46.
4Antonelli A, Miccoli P, Fallahi P, et al. Role of neck ultrasonography in the follow up of children operated on for thyroid papillary cancer. Thyroid,2003,13(5) :479- 484.
5Chan BK, Desser TS, McDougall IR, et al. Common and uncom mon sonographic features of papillary thyroid carcinoma. J Ultra sound Med,2003,22(10) :1083- 1090.
6Chammas MC,Gerhard R,De Oliveira IR, et al. Thyroid nodules evaluation with power Doppler and duplex Doppler ultrasound. Otolaryngol Head Neck Surg, 2005,132(6) : 874 -882.
7Ito Y,Kobayashi K, Tomoda C, et al. Ill defined edge on ultrasonographic examination can be a marker of aggressive character istic of papillary thyroid microcarcinoma. World J Surg, 2005,29 (8) : 1007-1012.
8Wada N,Duh QY,Sugino K, et al. Lymph node metastasis from259 papillary thyroid microcarcinomas: frequency, pattern of occurrence and recurrence, and optimal strategy for neck dissection. Ann Surg,2003,237(3):399-407.