CQ31. What Is the Definition of Poorly Differentiated Carcinoma? What Is Its Prevalence and Prognosis?

  • Yasuhiro Ito
  • Hiroshi Kanma


Poorly differentiated carcinoma is a pathological entity proposed by Sakamoto et al. [1] and Carcangiu et al. [2] in the 1980s and it was adopted as a histopathological category independent from follicular and papillary carcinomas in the WHO classification in 2004 [3]. In the General Rules for the Description of Thyroid Cancer, the Japanese Society of Thyroid Surgery had previously classified poorly differentiated type follicular carcinoma and poorly differentiated type papillary carcinoma separately, but in the revision in 2005, the two were merged into poorly differentiated carcinoma and defined as an independent histological type in response to the WHO classification [4, 5].


Thyroid Cancer General Rule Japanese Society Papillary Carcinoma Thyroid Surgery 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Japan 2013

Authors and Affiliations

  1. 1.Department of SurgeryKuma HospitalKobeJapan
  2. 2.Department of PathologyKyorin University School of MedicineTokyoJapan

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