JOURNAL OF JAPAN SOCIETY FOR HEAD AND NECK SURGERY
Online ISSN : 1884-474X
Print ISSN : 1349-581X
ISSN-L : 1349-581X
Follicular variant of papillary thyroid carcinoma: Comparison with 4th edition WHO classification
Atsushi HanamotoYukiko YamaneMikako SugimotoYasuo MishiroTsunemasa Aiba
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2021 Volume 31 Issue 1 Pages 7-12

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Abstract

In the WHO classification, 4th edition revised in 2017, regarding the pathological findings of conventional follicular variant of papillary thyroid carcinoma, non-invasive follicular thyroid neoplasm with papillary-like unclear features (NIFTP) and well-differentiated tumor of uncertain malignant potential (WDT-UMP) have been newly defined as tumors in the boundary region between benign and malignant tumors. We re-examined the pathological findings of thyroid cancer in 11 cases diagnosed as follicular variant of papillary thyroid carcinoma in our department. Of these, 4 cases were follicular variant of papillary thyroid carcinoma, 5 were NIFTP, and 2 were WDT-UMP according to the WHO classification, 4th edition. It was difficult to predict these pathological findings by preoperative ultrasonography, CT, and fine-needle aspiration cytology. In the future, genetic testing by fine-needle aspiration cytology may be used to predict pathological findings before surgery, and individualized treatment may be possible.

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© 2021 JAPAN SOCIETY FOR HEAD AND NECK SURGERY
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