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Lymph node involvement in macroscopic medullary thyroid carcinoma.

P Tamagnini1, M Iacobone, F Sebag

  • 1Department of General and Endocrine Surgery, University Hospital La Timone, 13385 Marseilles, France. ptamagnini@hotmail.com

The British Journal of Surgery
|January 27, 2005
PubMed
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For large medullary thyroid carcinoma (MTC), preoperative factors do not predict nodal metastasis. Total thyroidectomy and neck node dissection are the recommended treatments for MTC.

Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Pathology

Background:

  • Medullary thyroid carcinoma (MTC) is a rare endocrine neoplasm.
  • Lymphatic spread in MTC is variable, impacting prognosis.
  • Identifying features of nodal metastasis in large MTC is crucial for treatment planning.

Purpose of the Study:

  • To identify distinctive clinical and pathological features differentiating large medullary thyroid carcinoma (MTC) with and without nodal metastases.
  • To evaluate preoperative predictors of lymph node involvement in MTC.

Main Methods:

  • Retrospective analysis of 28 patients with sporadic MTC larger than 10 mm.
  • All patients underwent total thyroidectomy and neck node dissection.
  • Comparison of clinicopathological characteristics between patients with and without lymph node metastases (N0 vs. N1).

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Main Results:

  • No significant differences in age, sex, preoperative calcitonin, or tumor size between N0 and N1 groups.
  • Tumor invasion, vascular embolism, and peritumoral thyroiditis were significantly different between groups (P < 0.001, P = 0.011, P = 0.039, respectively).
  • Biochemical cure rates post-surgery differed, with all N0 patients achieving cure versus half of N1 patients (P = 0.006).

Conclusions:

  • Preoperative factors did not predict nodal status in large MTC (>1 cm) in this cohort.
  • Total thyroidectomy combined with comprehensive nodal dissection remains the standard surgical approach for MTC.
  • Pathological findings like tumor invasion and vascular embolism may be associated with nodal spread.