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Thyroid microcarcinoma: prevalence, prognosis, and management
R Arem1, S J Padayatty, A H Saliby
1Division of Endocrinology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
Summary
Thyroid microcarcinoma (TMC) is common but often indolent, posing a management dilemma due to potential for aggressive behavior and recurrence. High-risk patients may benefit from aggressive treatment strategies.
Area of Science:
- Endocrinology
- Oncology
Background:
- Thyroid microcarcinoma (TMC), defined as well-differentiated thyroid cancer ≤15 mm, has a high prevalence (5-10%) based on autopsy studies.
- Most TMCs are smaller than 5 mm, contrasting sharply with the low incidence of larger thyroid cancers in the US.
Purpose of the Study:
- To review the clinical course, prognosis, and treatment of patients with thyroid microcarcinoma (TMC).
Main Methods:
- Discussion of predisposing factors, TMC behavior modulation, diagnostic evaluation, and management options.
- Review of existing literature on TMC prevalence, clinical presentation, and prognostic indicators.
Main Results:
- TMC often remains quiescent, but can exhibit aggressive behavior in some cases.
- Adverse prognostic factors include older age, multifocality, bilateral disease, and extrathyroidal spread.
- Recurrence rates after partial thyroidectomy for TMC can reach 11%.
Conclusions:
- TMC management decisions are guided by fine-needle aspiration biopsy results and nodule growth rate.
- Aggressive management is recommended for high-risk patients, including older individuals, those with radiation exposure history, multifocal/bilateral disease, or lymph node involvement.