FIG. 1.

Follow-up of 699 non-diagnostic nodules. *Considered benign at follow-up. **If surgery or a repeat diagnostic biopsy was available, not included in the ultrasound category. ***Patients with thyroid surgery, a repeat diagnostic biopsy or ≤20% growth by ultrasound (US) ≥3 years were not contacted by mail. †Forty-one patients with a repeat biopsy that was non-diagnostic or suspicious for follicular neoplasm and 15 patients with a follow-up US <3 years or with >20% growth were contacted by mail.