Papillary thyroid microcarcinoma: Is active surveillance always enough?

Area of Science:

• Endocrinology
• Oncology
• Diagnostic Imaging

Background:

• The incidence of papillary thyroid carcinoma (PTC), particularly papillary thyroid microcarcinoma (PTMC) ≤10 mm, has increased significantly.
• This rise is linked to incidental detection during imaging for other conditions, leading to concerns about overdiagnosis.
• While most PTMCs are indolent, a subset exhibits aggressive behavior, including metastasis and lymph node involvement.

Purpose of the Study:

• To review active surveillance strategies for preoperatively diagnosed PTMC.
• To identify clinical features distinguishing indolent PTMC from those with aggressive progression and metastasis.
• To inform management decisions for PTMC, balancing active surveillance with surgical intervention.

Main Methods:

• Literature review of studies on active surveillance for PTMC.
• Analysis of clinical features associated with PTMC progression and metastasis.
• Comparison of management guidelines for PTMC diagnosed preoperatively versus incidentally post-thyroidectomy.

Main Results:

• Current guidelines do not recommend routine biopsy for nodules ≤10 mm, even with suspicious ultrasound features.
• Active surveillance is a recognized alternative for low-risk PTMC without lymph node or distant metastasis.
• Identifying specific clinical indicators for PTMC progression remains a challenge.

Conclusions:

• Distinguishing between indolent PTMC and those with aggressive potential is crucial for appropriate management.
• Active surveillance offers a less invasive approach for select PTMC cases.
• Further research is needed to refine criteria for identifying high-risk PTMC suitable for closer monitoring or intervention.