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My thyroid nodule biopsy doesn't say if it's cancer. What happens next?
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What comes next depends on your report's category in the Bethesda classification. If it came back indeterminate, it can be watched with ultrasound or biopsied again. The sample can also get molecular testing, or just half the thyroid can be removed. Your doctor decides which fits, based on the nodule and on you.
Why can't a thyroid needle biopsy always tell whether a nodule is cancer?
The needle pulls out loose cells, and sometimes their appearance can't show whether the nodule is benign or cancer. That can happen even with a good sample, in up to 20 of every 100 biopsies. If the report says follicular neoplasm, a nodule made of the thyroid's own cells, the answer comes from the removed nodule.
If the biopsy didn't confirm cancer, why am I being sent to a surgical oncologist?
For some results, surgery clarifies the diagnosis. Bethesda IV means follicular neoplasm; V means suspicious for malignancy and usually leads to surgery. Whether to operate and how much to remove depend on your risk.
What should I bring and ask if my nodule came back indeterminate or shows blood flow?
Bring your current and past ultrasounds to see if the nodule grew or changed. If you had a biopsy, bring the report and ask which category the pathologist gave it. Ask if molecular testing on that same sample is available. If surgery comes up, ask what part of the thyroid they'd remove and why.
Micrograph: Ed Uthman, Papillary Thyroid Carcinoma, FNA, Giemsa stain, CC BY 2.0.
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Where this comes from
- Bethesda System for Reporting Thyroid Cytopathology 2023 (international cytopathology system, aligned with WHO 2022): accessed 2026-10-14
- American Thyroid Association (2015 guidelines for thyroid nodules and differentiated thyroid cancer): accessed 2026-10-14
- American Thyroid Association: accessed 2026-10-14
- American Thyroid Association: accessed 2026-10-14
- American Thyroid Association (ATA): accessed 2026-10-14
- Maddaloni et al., European Thyroid Journal 2020 (article): accessed 2026-10-14
- American Thyroid Association (ATA), Clinical Thyroidology for the Public: accessed 2026-10-14
- American College of Radiology (ACR TI-RADS): accessed 2026-10-14
This is educational content, meant to help you understand your body. It is not a medical consultation or a diagnosis, and it does not tell any particular person what to do. If something worries you, see a doctor you trust.