Table 1. A general comparison of global systems.

Categories	USA [2008]	United Kingdom [2011]	Italy [2014]	Australia [2014]	Japan [2013]
1	Non-diagnostic/unsatisfactory	Thy1. Non diagnostic further subdivided: non-cystic; cystic	TIR1. Non-diagnostic: and cystic	Non-diagnostic	1. Inadequate (non-diagnostic)
2	Benign	Thy2. Non-neoplastic	TIR2. Non-malignant/benign	Benign	2. Normal benign
3	Atypia of undetermined significance or follicular lesion of undetermined significance (AUS/FLUS)	Thy 3a. Neoplastic possible—atypia	TIR3a. Low risk indeterminate lesion	Indeterminate or follicular lesion of undetermined significance	3a. Indeterminate-Follicular
4	Follicular neoplasm suspicious for follicular neoplasm ((FN/SFN)	Thy 3f. Neoplastic possible- Suggesting a follicular neoplasm	TIR3b. High risk indeterminate lesion	Suggestive of follicular neoplasm	3b. Indeterminate-others
5	Suspicious of malignancy	Thy 4. Suspicious of malignancy	TIR4. Suspicious of malignant	Suspicious of malignancy	4. Malignancy suspected
6	Malignant	Thy 5. Malignant	TIR5. Malignant	Malignant	5. Malignancy