Hobnail Variant of Papillary Thyroid Carcinoma: Clinicopathologic and Molecular Evidence of Progression to Undifferentiated Carcinoma in 2 Cases.

2017 
The hobnail variant (HV) of papillary thyroid carcinoma (PTC) is an unusual entity recently proposed as an aggressive variant of PTC. We describe the pathologic and molecular features of 2 cases of HV of PTC. Both tumors presented in stage III (pT3 pN1a M0). The first case was diagnosed in a 62-year
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