2Baudin E, Travagli JP, Ropers J, et al. Microearcinoma of the thyroid gland:the Gustave-Roussy Institute experience. Cancer, 1998,83 : 553-559.
3Wang N, Xu Y, Ge C, et al. Association of sonographically detected calcification with thyroid carcinoma. Head Neck,2006,28:1077-1083.
4Papini E, Guglielmi R, Bianchini A, et al. Risk of malignancy in nonpalpable thyroid nodules: predictive value of ultrasound and color-Doppler features. J Clin Endocrinol Metab, 2002, 87: 1941- 1946.
5Kim EK,Park CS, Chung WY, et al. New sonographic criteria for recommending fine-needle aspiration biopsy of nonpalpable solid nodules of the thyroid. Am J Roentgenol, 2002,178 :687-691.
6Cappelli C, Castellano M, Pirola I, et al. Thyroid nodule shape suggests malignancy. Eur J Endocrinol, 2006,155 :27-31.
7Cappelli C, Pirola I, Cumetti D, et al. Is the anteroposterior and transverse diameter ratio of nonpalpable thyroid nodules a sonographic criteria for recommending fine-needle aspiration cytology? Clin Endocrinol, 2005,63 : 689-693.
8Ito Y, Kobayashi K, Tomoda C, et al. Ill-defined edge on ultrasonographic examination can be a marker of aggressive characteristic of papillary thyroid microcarcinoma. World J Surg. 2005,29: 1007-1011.
9Jun P,Chow LC,Jeffrey RB. The sonographie features of papillary thyroid carcinomas : pictorial essay. Ultrasound Q,2005,21:39-45.
10Wong KT, Ahuja AT. Ultrasound of thyroid cancer. Cancer Imaging, 2005,5 : 157-166.