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In: Lloyd RV, Osamura RY, Kroppel G, Rosai J (eds.) WHO classification of tumors of endocrine organs, 4th ed. IARC, Lyon, France: 81\u201391."},{"key":"2","doi-asserted-by":"crossref","unstructured":"2 Motosugi U, Murata S, Nagata K, Yasuda M, Shimizu M (2009) Thyroid papillary carcinoma with micropapillary and hobnail growth pattern: a histological variant with intermediate malignancy. Thyroid 19: 535\u2013537.","DOI":"10.1089\/thy.2008.0271"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3 Cameselle-Teijeiro JM, Rodriguez-Perez I, Celestino B, Eloy C, Piso-Neira M, et al. (2017) Hobnail variant of papillary thyroid carcinoma: clinicopathologic and molecular evidence of progression to undifferentiated carcinoma in 2 cases. Am J Sur Pathol 41: 854\u2013860.","DOI":"10.1097\/PAS.0000000000000793"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4 Asioli S, Erickson LA, Sebo TJ, Zhang J, Jin L, et al. (2010) Papillary thyroid carcinoma with prominent hobnail features: a new aggressive variant of moderately differentiated papillary carcinoma. A clinicopathologic, immunohistochemical, and molecular study of eight cases. Am J Surg Pathol 34: 44\u201352.","DOI":"10.1097\/PAS.0b013e3181c46677"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5 Asioli S, Erickson LA, Righi A, Lloyd RV (2013) Papillary thyroid carcinoma with hobnail features: histopathologic criteria to predict aggressive behavior. Hum Pathol 44: 320\u2013328.","DOI":"10.1016\/j.humpath.2012.06.003"},{"key":"6","doi-asserted-by":"publisher","unstructured":"6 Watutantrige-Fernando S, Vianello F, Barollo S, Bertazza L, Galuppini F, et al. (2018) The hobnail variant of papillary thyroid carcinoma: clinical\/molecular characteristics of a large monocentric series and comparison with conventional histotypes. Thyroid 28: 96\u2013103.","DOI":"10.1089\/thy.2017.0248"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7 Lubitz CC, Economopoulos KP, Pawlak AC, Lynch K, Dias-Santagata D, et al. (2014) Hobnail variant of papillary thyroid carcinoma: an institutional case series and molecular profile. Thyroid 24: 958\u2013965.","DOI":"10.1089\/thy.2013.0573"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8 Morandi L, Righi A, Maletta F, Rucci P, Pagni F, et al. (2017) Somatic mutation profiling of hobnail variant of papillary thyroid carcinoma Endocr Relat Cancer 24: 107\u2013117.","DOI":"10.1530\/ERC-16-0546"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9 Ieni A, Barresi V, Cardia R, Licata L, Di Bari F, et al. (2016) The micropapillary\/hobnail variant of papillary thyroid carcinoma: a review of series described in the literature compared to a series from one southern Italy pathology institution. Rev Endocr Metab Disord 17: 521\u2013527.","DOI":"10.1007\/s11154-016-9398-4"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10 Amacher AM, Goyal B, Lewis Mr. JS, El-Mofty SK, Chermock RD (2015) Prevalence of a hobnail pattern in papillary, poorly differentiated, and anaplastic thyroid carcinoma; a possible manifestation of high-grade transformation. Am J Surg Pathol 39: 260\u2013265.","DOI":"10.1097\/PAS.0000000000000329"},{"key":"11","doi-asserted-by":"publisher","unstructured":"11 Teng L, Deng W, Lu J, Zhang J, Ren X, et al. (2017) Hobnail variant of papillary thyroid carcinoma: molecular profiling and comparison to classical papillary thyroid carcinoma, poorly differentiated thyroid carcinoma, and anaplastic thyroid carcinoma. Oncotarget 8: 22023\u201322033.","DOI":"10.18632\/oncotarget.15786"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12 Linn-Silva LS, Dominguez-Malagon HR, Caro-Sanchez CH, Salcedo-Hermandez RA (2012) Thyroid gland papillary carcinomas with \u201cmicropapillary pattern,\u201d a recently recognized poor prognostic finding: clinicopathologic and survival analysis of 7 cases. Hum Pathol 43: 1596\u20131600.","DOI":"10.1016\/j.humpath.2011.10.027"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13 Agarwal S, Sadiq Q, Ortanca I (2020) Hobnail cells in encapsulated papillary thyroid carcinoma: report of 2 cases with immunohistochemical and molecular findings and literature analysis. Pathol Res Pract 216: 152678.","DOI":"10.1016\/j.prp.2019.152678"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14 Yokozawa T, Fukata S, Kuma K, Matsuzuka F, Kobayashi A, et al. (1996) Thyroid cancer detected by ultrasound-guided fine-needle aspiration biopsy. World J Surg 20: 848\u2013853.","DOI":"10.1007\/s002689900129"},{"key":"15","unstructured":"15 Japan Association of Breast and Thyroid Sonology (2016) Thyroid ultrasound\u2014a guidebook for diagnosis and management. 3rd edition, Nankodo, Tokyo, Japan (In Japanese)."},{"key":"16","doi-asserted-by":"crossref","unstructured":"16 Ito Y, Miyauchi A, Kakudo K, Hirokawa M, Kobayashi K, et al. (2010) Prognostic significance of Ki-67 labeling index in papillary thyroid carcinoma. 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