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Table 2 Recommendations for diagnostic FNA based on size and US features [1, 3537, 85, 86, 118120]

From: Thyroid nodule update on diagnosis and management

A. Nodules ≥ 1 cm with intermediate or high suspicion US pattern
B. Nodules ≥ 1.5 cm with low suspicion US pattern
C. Nodules ≥ 2 cm with very low suspicion US pattern (e.g., spongiform). Observation an alternate option.
D. For nodules that do not meet the above criteria, FNA is not required, including nodules < 1 cm (with some exceptions) and purely cystic nodules.
 ATA Guidelines 2015