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Multi- and Unifocal Thyroid Microcarcinoma: Are There Any Differences?
Krzysztof Kaliszewski1, Agnieszka Zubkiewicz-Kucharska2, Beata Wojtczak1
11st Department and Clinic of General, Gastroenterological and Endocrinological Surgery, Wroclaw Medical University, Poland.
Summary
Unifocal thyroid microcarcinoma (UTMC) is significantly more common than multifocal thyroid microcarcinoma (MTMC). Both types are primarily papillary cancer, with comparable lymph node involvement and no observed mortality.
Area of Science:
- Endocrinology
- Oncology
- Surgical Pathology
Background:
- Thyroid microcarcinoma (TMC) can present as multiple foci, potentially requiring further surgery.
- Understanding the differences between unifocal and multifocal presentations is crucial for surgical planning.
Purpose of the Study:
- To compare the incidence, diagnostic accuracy, clinicopathological features, and surgical outcomes of unifocal thyroid microcarcinoma (UTMC) versus multifocal thyroid microcarcinoma (MTMC).
Main Methods:
- Retrospective analysis of 3,218 thyroid pathology patient records.
- Evaluation of 246 patients with thyroid malignancy, focusing on 97 diagnosed with TMC.
Main Results:
- UTMC (86.59%) was significantly more prevalent than MTMC (13.41%).
- Both UTMC and MTMC were predominantly papillary thyroid cancer.
- Ultrasound-guided fine needle aspiration biopsy (UG-FNAB) showed higher accuracy for MTMC.
- Cervical lymph node involvement was comparable and not infrequent in both groups.
- No disease-related mortality was observed in either group.
Conclusions:
- Unifocal thyroid microcarcinoma is significantly more common than multifocal presentations.
- Papillary thyroid cancer is the predominant type in both UTMC and MTMC.
- Diagnostic accuracy of UG-FNAB is higher for MTMC, and lymph node involvement is similar for both.
- Surgical management considerations for UTMC and MTMC require careful evaluation of these characteristics.

