2Papini E, Guglielimi R, Biancbini A, et al. Risk of malignancy in nonpalpable thyroid nodules, predictive value to ultrasound and color-Doppler features, J Clin Endocrinol Metab, 2002,87 : 1941- 1946.
3Frates MC, Benson CB, Doubilet PM, et al. Prevalence and distribution of carcinoma in patients with solitary and multiple thyroid nodules on sonography. J Clin Endocrinol Metab, 2006, 91:3411-3417.
4MoonWJ,Jung SL, Lee JH-, et al. Benign and malignant thyroid nodules: US differentiation--multicenter retrospective study. Radiology,2008,247 : 762-770.
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.
6Alexander EK, Marqusee E, Orcutt J, et al. Thyroid nodule shape and prediction of malignancy. Thyroid, 2004,14 : 953-958.
7Watters DA, Ahuja At, Evans RM,et al. Role of ultraound in the management of thyroid nodules. Am J Surg, 1992,164:654-657.
8Solbiati L, Osti V, Cova L, et al. Ultrasound of thyroid, parathyroid glands and neck lymph nodes. Eur Radiol,2001,11 : 2411-2424.
9Kim BM,Kim MJ,Kim EK, et al. Sonographic differentiation of thyroid nodules with eggshell calcifications. J Ultrasound Med, 2008,27 : 1425-1430.
10Reading CC, Charboneau JW, Hay ID, et al. Sonography of thyroid nodules: a " classic pattern" diagnostic approach. Ultrasound Q,2005,21 : 157-165.
