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Thyroid nodule pathway

TI-RADS, FNAC, Bethesda: — The Full Thyroid Pathway

If your doctor has mentioned TI-RADS, FNAC, or Bethesda, they are describing three steps in the same pathway — from spotting a thyroid nodule on ultrasound to understanding what the cells inside it look like.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Three steps, one pathway — TI-RADS, FNAC, and Bethesda are not separate tests — each one feeds directly into the next.
  • Most nodules are benign — Finding a thyroid nodule is common. This pathway exists to identify the small minority that need treatment.
  • The sequence is the same for most people — Ultrasound and scoring first, then a biopsy decision, then a pathology report.
  • Indeterminate is not a cancer diagnosis — Bethesda III and IV describe uncertainty about the cells — not confirmed cancer.
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TI-RADS scores your thyroid nodule on ultrasound and determines whether a biopsy is needed. FNAC is that biopsy — a short needle procedure. The pathologist then classifies the sample using Bethesda, a six-category system that guides the next step. The three systems are one sequential pathway, not separate tests.

How do TI-RADS, FNAC, and Bethesda connect?

TI-RADS is a scoring system your radiologist uses during a thyroid ultrasound. It assigns points based on the nodule's features — its composition, shape, edges, and internal characteristics. A higher score means the nodule has features more likely to need investigation.

When the TI-RADS score suggests a biopsy is warranted, your doctor recommends FNAC. A thin needle samples cells directly from the nodule under ultrasound guidance. It usually takes under fifteen minutes, and you leave the same day.

Those cells go to a pathologist, who examines them under a microscope and assigns a Bethesda category. That category tells your team how likely the nodule is to be cancerous and what the recommended next step is.

What does your doctor need to know before recommending FNAC?

  • Tell your doctor if anyone in your family has had thyroid cancer or a syndrome such as MEN2.
  • Mention any radiation treatment you have had to your neck or head at any point in your life.
  • Bring previous thyroid scan reports so your doctor can see whether the nodule has grown.
  • Note new symptoms — difficulty swallowing, a voice that has changed, or a lump that feels firmer.
  • Tell your team about any supplements or herbal preparations you are taking that may affect thyroid function.

What happens at each stage of the pathway?

  1. Nodule found

    A thyroid nodule is discovered on ultrasound — sometimes because you felt something in your neck, often by chance during a scan done for another reason. Finding a nodule is very common.

  2. Ultrasound and TI-RADS scoring

    Your radiologist scores the nodule on its composition, shape, edges, and internal features. The total gives a TI-RADS category from 1 (normal thyroid tissue) to 5 (highly suspicious).

  3. FNAC decision

    Your doctor reviews the TI-RADS category alongside the nodule's size and your clinical history. Lower categories typically mean observation; higher categories typically mean biopsy.

  4. FNAC procedure

    A thin needle is guided into the nodule under live ultrasound. Cells are drawn out, placed on glass slides, and sent to the pathology laboratory. You go home the same day.

  5. Bethesda report

    The pathologist examines the cells and assigns a Bethesda category from I to VI. Results usually return within a few days to two weeks.

  6. Next steps discussion

    Your oncologist or surgeon explains the Bethesda result and what it means for your nodule — surveillance, a repeat FNAC, molecular testing, or surgery.

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What does each Bethesda category mean?

Bethesda I — Non-diagnostic
The sample did not contain enough cells to assess. This is not uncommon and does not mean something serious was found. A repeat FNAC is usually recommended.
Bethesda II — Benign
The cells look normal. The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC, 2017) places the estimated risk of cancer at this category as very low. Surveillance ultrasound is the usual plan.
Bethesda III — Atypia of undetermined significance
The cells have some unusual features but cannot be classified as clearly benign or clearly suspicious. This is an indeterminate result — uncertain, not alarming. Repeat FNAC or molecular testing is often recommended.
Bethesda IV — Follicular neoplasm
The cells could be a benign follicular adenoma or a follicular carcinoma. FNAC cannot tell the two apart. Surgery or molecular testing is usually recommended to answer the question.
Bethesda V — Suspicious for malignancy
The cells are concerning for cancer but the result is not yet conclusive. Surgery is typically recommended.
Bethesda VI — Malignant
The cells are diagnostic of cancer. The type is specified where possible. Surgery is planned, and your team will explain your stage and treatment options.

What are the risks at each step?

The ultrasound and TI-RADS scoring carry no procedural risk. It is an imaging test — no needles and no radiation.

FNAC carries a small chance of bruising or mild bleeding at the puncture site. The area may feel tender for a day or two. Serious complications are uncommon. The needle is guided by live ultrasound throughout, so the radiologist can see exactly where it is going.

There is no procedural risk from the Bethesda report itself. An indeterminate result — Bethesda III or IV — can feel unsettling, but it means the cells could not be classified clearly in either direction. It does not mean cancer has been found.

Did you know?

The majority of thyroid nodules that go through this full pathway receive a Bethesda II — benign — result.

When thyroid cancer is found through this pathway, it is typically at an early stage, when outcomes with treatment are good.

Source: American Thyroid Association (ATA) Guidelines for Adult Patients with Thyroid Nodules and Differentiated Thyroid Cancer, 2015

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Common questions

Frequently asked questions

My TI-RADS score is 3 — does that mean I need a biopsy?

Not necessarily. A TI-RADS 3 result means mildly suspicious features, but whether FNAC is recommended depends also on the nodule's size and whether it has grown since a previous scan. Many TI-RADS 3 nodules are managed with periodic observation rather than immediate biopsy. Your doctor uses the TI-RADS score alongside everything else they know about your nodule, not as a standalone decision.

How long does the Bethesda result take after FNAC?

Most results return within a few days to two weeks, depending on the laboratory and whether additional staining is needed. If the sample goes for molecular testing — sometimes done for Bethesda III or IV results — the timeline extends, often to two to four weeks. Ask your team when the sample was dispatched so you have an expected date rather than waiting without a timeline.

My result is Bethesda III — does that mean cancer?

No. Bethesda III means the cells had some atypical features but could not be classified as clearly benign or clearly suspicious. It is an indeterminate category — the pathologist is describing uncertainty, not cancer. Many Bethesda III nodules turn out to be benign after further investigation. Your doctor will recommend a repeat FNAC, molecular testing, or surveillance depending on your specific nodule.

Is FNAC painful?

Most people describe brief, mild discomfort — similar to a blood draw rather than significant pain. A local anaesthetic is sometimes applied to the skin first. The needle is very thin and guided by live ultrasound, so the procedure is precise and usually takes under fifteen minutes. Any tenderness at the site typically settles within a day or two.

What happens if the FNAC result is non-diagnostic — Bethesda I?

It means the sample did not contain enough cells to assess properly. This happens in a minority of FNACs and does not mean something serious was found. Your doctor will usually recommend repeating the procedure. On a second attempt, most nodules yield a result that can be categorised.

Can the Bethesda result be wrong?

Like any diagnostic test, cytology has limits. A Bethesda II result is very reassuring but does not rule out cancer entirely, which is why surveillance ultrasound continues even after a benign result. Bethesda V and VI are highly reliable. For indeterminate categories, the uncertainty is part of the category itself — it signals that the question cannot be resolved from cells alone, which is why surgery or molecular testing is then offered.

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