Poorly differentiated carcinoma is a pathological entity proposed by Sakamoto et al.  and Carcangiu et al.  in the 1980s and it was adopted as a histopathological category independent from follicular and papillary carcinomas in the WHO classification in 2004 . 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
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