Thyroid adenoma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Roukoz A. Karam, M.D.[2]

Classification

• Thyroid nodules may be classified according to TI-RADS (Thyroid Imaging Reporting and Date System) into 6 groups:

Type	Description	Score	Risk of malignancy
TI-RADS 1	Normal thyroid gland No focal lesion	0	0%
TI-RADS 2	Benign nodules Noticeably benign pattern	0	0%
TI-RADS 3	Probably benign nodules	0	< 5%
TI-RADS 4a	Undetermined nodules	1	5 - 10%
TI-RADS 4b	Suspicious nodules	2	10 - 50%
TI-RADS 4c	Highly suspicious nodules	3 - 4	50 - 85%
TI-RADS 5	Probably malignant nodules	5 or >	> 85%
TI-RADS 6	Biopsy proven malignancy	-	100%