Papillary microcarcinoma of the thyroid

Area of Science:

• Endocrinology
• Oncology
• Surgical Pathology

Background:

• Papillary microcarcinoma (PMC) of the thyroid is frequently detected via fine-needle aspiration biopsy cytology with ultrasonographic guidance.
• Autopsy studies reveal numerous small thyroid carcinomas, leading some to question their clinical significance.

Purpose of the Study:

• To analyze the clinical behavior and outcomes of patients with papillary microcarcinoma (PMC) measuring 10 mm or less.
• To determine the necessity of surgical intervention for PMC based on observed metastatic potential.

Main Methods:

• Retrospective analysis of 112 patients diagnosed with papillary microcarcinoma (PMC) ≤10 mm, treated between 1992 and 1995.
• Preoperative diagnosis confirmation, ultrasound-guided aspiration biopsy cytology, and modified neck dissection were performed.
• Evaluation of lymph node metastasis, tumor size correlation, and clinical presentation was conducted.

Main Results:

• Preoperative diagnosis was achieved in 89.3% of patients; 77 underwent ultrasound-guided aspiration biopsy.
• Modified neck dissection in 70 patients revealed lymph node metastases in 63.8%, with increased metastasis correlating to larger primary tumor size.
• No clear clinical distinctions were found between tumors ≤10 mm and those >10 mm; one case of lymph node recurrence and one of recurrent nerve palsy were noted.

Conclusions:

• Papillary microcarcinoma (PMC), despite its small size, exhibits metastatic potential to lymph nodes.
• The presence of lymph node metastases and lack of clear clinical differences between small and larger tumors suggest that PMC warrants surgical treatment.