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Thyroid Nodule Evaluation Algorithm

Stratified TIRADS, fine-needle aspiration, and Bethesda classification guide diagnosis and treatment of thyroid nodules.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Endokrinoloji department. Book Appointment →

What is Thyroid Nodule Evaluation Algorithm?

Thyroid nodules are detected in 4-7% of adults by palpation and 30-50% by ultrasound; 5-10% are malignant. Algorithm: TSH level → US (TIRADS) → FNAB if necessary → Bethesda → treatment.

First step: TSH measurement. Suppressed TSH → thyroid scintigraphy (hot nodule, follow up). Normal/elevated TSH → ultrasonographic TIRADS classification: TR1 (benign) - TR5 (highly suspicious).

FNAB indications: TR3 ≥2.5 cm, TR4 ≥1.5 cm, TR5 ≥1 cm, suspicious lymphadenopathy. Bethesda: I (insufficient), II (benign), III (AUS/FLUS), IV (FN/SFN), V (suspicious for malignancy), VI (malignant). Treatment: II → follow-up, III/IV → repeat FNAB or molecular test (Afirma, ThyroSeq), V/VI → surgery.

Symptoms

Palpable nodule (often asymptomatic)
Compressive symptoms (large nodules)
Hyperthyroid symptoms (toxic nodule)
Hoarseness (recurrent laryngeal nerve)
Dysphagia, dyspnea
Cervical lymphadenopathy

Risk Factors

Female gender (4:1)
History of head and neck radiation
Family history of thyroid cancer (MEN2, FAP)
Iodine deficiency
Hashimoto's thyroiditis
Advanced age

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Palpable neck swelling
  • Hoarseness with cervical mass
  • Cervical lymphadenopathy
  • History of childhood radiation
  • Family history of MEN2
  • Rapidly growing nodule

Treatment Methods

01
Bethesda II: 12-24 month US follow-up
02
Bethesda III: repeat FNAB or molecular test
03
Bethesda IV: lobectomy or molecular test
04
Bethesda V/VI: total thyroidectomy + central LND
05
Toxic nodule: RAI or surgery
06
RFA (radiofrequency ablation): benign symptomatic nodule

Which Department to Visit?

You can visit our Endokrinoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Let us help you

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