Referral Pathway for Confirmed Thyroid Nodules

Initial Diagnostic Evaluation

• Fine-needle aspiration biopsy (FNAB) is the preferred diagnostic method for thyroid nodules and should be performed to confirm the pathological diagnosis before determining management 1, 3
• Ultrasound-guided FNAB is accurate, economical, safe, and effective for diagnosing thyroid nodules 1
• Core needle biopsy (CNB) should be reserved for patients with FNAB-undiagnosed thyroid nodules 1
• Complete ultrasound evaluation of both the thyroid and cervical lymph nodes should be performed when thyroid nodules are found 1

Referral Algorithm Based on FNAB Results

For Benign Nodules:

• Symptomatic nodules or nodules ≥2 cm with gradual increase in size: Refer to interventional radiology for consideration of thermal ablation 1, 3

For Indeterminate, Suspicious, or Malignant Nodules:

• For recurrent thyroid cancer with limited metastatic cervical lymph nodes: Consider referral to interventional radiology for thermal ablation 1

Special Considerations for Referral

• Patients with autonomously functioning thyroid nodules should be referred to both endocrinology and interventional radiology 1
• Pregnant women and patients with severe cardiopulmonary insufficiency require special consideration and should be initially evaluated by endocrinology 1
• Patients with contralateral vocal cord paralysis should be referred to otolaryngology before any invasive procedure 1

Post-Treatment Follow-Up

• Regular follow-up is required after treatment of both benign and malignant thyroid nodules 4
• Follow-up should include volume reduction rate assessment, evaluation of compression symptoms, cosmetic concerns, residual nodules, recurrence, metastasis, recovery from complications, and thyroid function 4
• For malignant nodules treated with thermal ablation, TSH suppression therapy should be implemented with endocrinology follow-up 4

Common Pitfalls in Referral Decisions

• Failing to perform FNAB before deciding on referral pathway 1
• Referring small (<1 cm) asymptomatic nodules without suspicious features for unnecessary procedures 5
• Not evaluating cervical lymph nodes during initial assessment, potentially missing metastatic disease 1
• Overlooking the need for specialized care in patients with contraindications to thermal ablation 1