ACR	American College of Radiology
ATA	American Thyroid Association
AUC	area under the curve
CNB	core needle biopsy
ETA	European Thyroid Association
EU	European
FNA	fine-needle aspiration
IRB	Institutional Review Board
K	Korean
KTA/KSThR	Korean Thyroid Association/Korean Society of Thyroid Radiology
LR	likelihood ratio
NIFTP	Noninvasive follicular thyroid neoplasms with papillary-like nuclear feature
ND/UNS	nondiagnostic/unsatisfactory
ROC	receiver operating characteristic
ROM	risk of malignancy
RSS	risk stratification system
TBSRTC	the Bethesda system for reporting thyroid cytopathology
TIRADS	Thyroid Imaging, Reporting and Data System
US	ultrasound