Impact of the modification of the diagnostic criteria in the2017 Bethesda System for Reporting Thyroid Cytopathology: a report of a single institutionin Japan

Endocrine journal

Miyoko Higuchi¹  Mitsuyoshi Hirokawa²  Risa Kanematsu³ 

[1] Department of Clinical Laboratory, Kuma Hospital, Kobe, Hyogo, Japan;Department of Diagnostic Pathology and Cytology, Kuma Hospital, Kobe, Hyogo, Japan;Department of Surgery, Kuma Hospital, Kobe, Hyogo, Japan

关键词: Thyroid;    Bethesda System;    Noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP);    Active surveillance;   

DOI  :  10.1507/endocrj.EJ18-0290

学科分类：内分泌与代谢学

来源: Japan Endocrine Society

【 摘 要 】

The Bethesda System for Reporting Thyroid Cytopathology has recently been revised in 2017 (TBSRTC 2017). This study aimed to evaluate the impact of modifying the diagnostic criteria in TBSRTC 2017 at a single institute. We retrospectively reviewed cytological specimens of 10,399 thyroid nodules submitted for thyroid fine-needle aspiration cytology. Among them, 56 atypia of undetermined significance or follicular lesion of undetermined significance (AUS/FLUS) nodules, 16 suspicious for malignancy (SFM) nodules, and 8 malignant nodules were re-categorized into follicular neoplasm or suspicious for a follicular neoplasm (FN/SFN). The incidence of FN/SFN was increased by 0.8%, while that of AUS/FLUS, SFM, and malignant nodule was decreased by 0.5%, 0.2%, and 0.1%, respectively. In nine (60%) of the 15 nodules that were re-classified from AUS/FLUS to FN/SFN nodules and re-aspiration was performed, it was possible to judge whether they were benign or malignant. Of the 24 patients with FN/SFN nodules originally diagnosed with SFM or malignant, 16 were followed up without surgical resection. In conclusion, TBSRTC 2017 only caused minor changes in the incidence of each diagnostic category. TBSRTC 2017 was revised to avoid false positives owing to noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP) that account for >10% of papillary thyroid carcinomas; however, it is not necessary in low frequency NIFTP institutes or countries. In Japan, we propose active surveillance as an accepted option for clinically managing AUS/FLUS, FN/SFN, SFM, or malignant nodules having favorable benign clinical findings or being part of the low-risk group.

【 授权许可】

Unknown