7Cappelli C, Castellano M, Pirola I, et al. Thyroid nodule shape suggests malignancy [J]. Eur J Endoerinol, 2006, 155(1):27-31.
8Jun P, chow LC, Jeffrey RB. The sonographic features of papillary thyroid carcinomas [J].Ultrasound Q,2005,21(1): 39-45.
9Kim EK, Park CS, Chung WY, et al. New sonographic criteria for recommending fine-needle aspiration biopsy of non-palpable solid nodules of the thyroid [J]. A JR Am J Roentgenol, 2002, 178(3):687-691.