4Lang WS, Borrusch H,Bauer L. Occult carcinomas of the thyroid. Evaluation of 1020 sequential autopsies [J]. AM J Clin Pathol, 1988,90 : 72-76.
5Hedinger C. Histological typing of thyroid tumors[A]. In WHO international histological classification of tumors [M].2nd. London: Springer, 1988,11 : 10-14.
6Mitselou A, Vougiouklakis T, Peschos D,et al. Occult thyroid carcinoma. A study of 160 autopsy cases. The first report for the region of Epirus-Greece [J]. Anticancer Res, 2002, 22(1A): 427-432.
7Lee HK, Hur MH, Ahn SM. Diagnosis of occult thyroid carcinoma by ultrasonography[J]. Yonsei Med J, 2003, 44 (6):1040-1044.
8Ito Y, Uruno T, Nakano K,et al. An observation trial without surgical treatment in patients with papillary microcarcinoma of the thyroid[J]. Thyroid, 2003,13(4) :381-387.
9Carpi A, Nicolini A, Casara D,et al. Nonpalpable thyroid carcinoma: clinical controversies on preoperative selection[J]. Am J Clin Oncol, 2003,26 (3): 232-235.
10Ruggieri M, Genderini M, Gargiulo P,et al. Surgical treatment of differentiated microcarcinomas of the thyroid[J]. Eur Rev Med Pharmacol Sci, 2001,5(3) :85-89.