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thyroid nodule TI-RADS FNAC management
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Thyroid Ultrasound Report - Explanation for Miss Shreya Salunkhe
Here is a clear, point-by-point breakdown of this report.
What Was Done
This is an ultrasonography (ultrasound) of the thyroid gland - a non-invasive imaging test that uses sound waves to examine the thyroid gland in the neck.
Key Findings - Plain Language
1. Left thyroid lobe - a nodule was found
A single lump (nodule) measuring 13 x 12 mm (roughly 1.3 cm x 1.2 cm) was found in the left side of the thyroid gland. Its characteristics:
| Feature | What the Report Says | Why It Matters |
|---|---|---|
| Composition | Predominantly solid | Solid nodules carry a slightly higher malignancy risk than fluid-filled (cystic) ones |
| Internal vascularity | Blood flow seen inside the nodule on Doppler | Can occur in both benign and malignant nodules |
| Microcalcifications | Multiple punctate echogenic foci | The most concerning feature - tiny calcium deposits that are a recognized risk marker for papillary thyroid cancer |
| No peripheral halo | No rim around the nodule | Halo absence is slightly more associated with malignancy |
| No extrathyroidal extension | Has not grown outside the thyroid capsule | Reassuring - no local invasion |
2. Right lobe and isthmus - completely normal. No nodules, no abnormality.
3. Cervical lymph nodes - a few small nodes (6-10 mm) seen alongside the jugular veins on both sides. They look entirely benign - they have normal fatty centers (hila) and thin walls. No cancer-suspicious features.
ACR TI-RADS Classification - What TR4 Means
The radiologists used the ACR TI-RADS (Thyroid Imaging Reporting and Data System) - the most widely used international scoring system for thyroid nodules. Points are awarded across five features:
| Feature | Score Given | Points |
|---|---|---|
| Composition (solid) | 2 points | |
| Echogenicity | (not markedly hypoechoic - no extra points beyond baseline) | |
| Punctate echogenic foci (microcalcifications) | 3 points | |
| Total | ~5 points = TR4 |
TR4 (Moderately Suspicious) carries an estimated malignancy risk of roughly 10-20%. This does NOT mean she has cancer - it means 1 in 5 to 1 in 10 nodules with these features turn out to be malignant on biopsy. The majority are benign.
The report also notes:
- If the nodule were markedly hypoechoic or taller-than-wide, it would be TR5 (Highly Suspicious, >20% risk)
- Based on current appearance, TR4 is the correct classification
Per Harrison's Principles of Internal Medicine (2025), for TR4 nodules with these features, FNA biopsy is recommended when the nodule reaches 1-1.5 cm - and this nodule at 1.3 cm meets that threshold.
What the Report Recommends - and Why
1. Ultrasound-guided FNAC (Fine Needle Aspiration Cytology)
This is a thin-needle biopsy done under ultrasound guidance. A tiny needle is passed into the nodule to collect a few cells, which are then examined under a microscope. It is the gold standard diagnostic test for thyroid nodules and is:
- Minimally painful (similar to a blood draw)
- Done as an outpatient procedure
- The most accurate way to determine if the nodule is benign or malignant
FNAC is recommended here because (a) the nodule is >1 cm and (b) it contains microcalcifications, which are a suspicious feature specifically associated with papillary thyroid carcinoma.
FNAC results typically fall into one of 6 Bethesda categories:
- Bethesda I: Non-diagnostic (repeat needed)
- Bethesda II: Benign (~5% malignancy risk - reassuring)
- Bethesda III/IV: Indeterminate (may need repeat or surgery)
- Bethesda V/VI: Suspicious/Malignant (surgery likely needed)
2. Thyroid function tests (TSH, Free T4 ± Free T3)
These blood tests check whether the thyroid is working normally. This helps determine:
- Whether the nodule is "functioning" (autonomous hot nodule - almost never malignant)
- Background thyroid health (hypo- or hyperthyroidism)
3. Follow-up ultrasound if FNAC is benign
If biopsy comes back benign, periodic ultrasound monitoring is recommended to watch for growth or change in appearance.
Key Takeaways for the Patient
-
A nodule was found in the left thyroid. This is common - thyroid nodules occur in up to 50% of adults. The vast majority are benign.
-
The nodule has one suspicious feature (microcalcifications) that warrants further testing - this is why FNAC is recommended.
-
ACR TR4 does not mean cancer. It means the nodule is "moderately suspicious" and needs a biopsy to clarify. Most TR4 nodules are benign on biopsy.
-
The right lobe is completely normal. Lymph nodes look benign. No spread outside the thyroid is seen.
-
Next steps: Get blood tests (TSH, Free T4), then proceed with ultrasound-guided FNAC at a facility experienced in thyroid biopsies. An endocrinologist or thyroid surgeon should be consulted.
Important note: This explanation is for educational purposes. Miss Shreya should discuss these findings and the recommended next steps with her treating doctor (Dr. Salunkhe Kailash) or an endocrinologist who can review the full clinical picture.
Sources: Harrison's Principles of Internal Medicine 22E (2025); Sabiston Textbook of Surgery, ACR TI-RADS classification framework.
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