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Despite this, the mortality caused by thyroid cancer has not increased, reflecting the low clinical aggressiveness of most papillary thyroid carcinomas (PTCs) and the quality of the available treatment. The criteria used to classify PTmC remain questionable, making the clinical risk evaluation of these lesions very difficult. There is no solid basis for establishing the most appropriate tumor size (currently &lt;10 mm) to distinguish PTmC from PTC. Moreover, PTmCs encompass all sorts of PTC histotypes, thus turning the whole group of PTmC genetically and biologically heterogeneous. In this review, we address the 2 most interesting issues from a practical standpoint: Are there any specific morphological or molecular features distinguishing PTmC from PTC? Is it possible to predict the clinical behavior of PTmC in fine needle aspiration biopsy and in surgical specimens, using morphological and\/or molecular markers? <\/jats:p>","DOI":"10.1177\/1066896913517394","type":"journal-article","created":{"date-parts":[[2014,1,9]],"date-time":"2014-01-09T04:41:58Z","timestamp":1389242518000},"page":"113-119","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":35,"title":["Papillary Thyroid Microcarcinoma"],"prefix":"10.1177","volume":"22","author":[{"given":"Paula","family":"Soares","sequence":"first","affiliation":[{"name":"Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), University of Porto, Porto, Portugal"},{"name":"Medical Faculty, University of Porto, Porto, Portugal"}]},{"given":"Ricardo","family":"Celestino","sequence":"additional","affiliation":[{"name":"Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), University of Porto, Porto, Portugal"}]},{"given":"Adriana","family":"Gaspar da Rocha","sequence":"additional","affiliation":[{"name":"Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), University of Porto, Porto, Portugal"},{"name":"Medical Faculty, University of Porto, Porto, Portugal"}]},{"given":"Manuel","family":"Sobrinho-Sim\u00f5es","sequence":"additional","affiliation":[{"name":"Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), University of Porto, Porto, Portugal"},{"name":"Medical Faculty, University of Porto, Porto, Portugal"},{"name":"Department of Pathology, Hospital S\u00e3o Jo\u00e3o, Porto, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2014,1,7]]},"reference":[{"key":"bibr1-1066896913517394","volume-title":"WHO Classification of Tumours. 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