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Medullary thyroid carcinoma, follicular variant
Mehtap Cakir1, Hasan Altunbas, Mustafa Kemal Balci
1Akdeniz University, Faculty of Medicine, Division of Endocrinology and Metabolism, Antalya, Turkey.
Endocrine Pathology
|July 13, 2002
Summary
This case study highlights a rare follicular variant of medullary thyroid carcinoma. Accurate diagnosis requires distinguishing it from mixed tumors using immunohistochemistry, particularly calcitonin and thyroglobulin staining.
Area of Science:
- Endocrinology
- Surgical Pathology
- Oncology
Background:
- Solitary thyroid nodules require careful diagnostic evaluation.
- Follicular neoplasia is a common preoperative diagnosis for thyroid nodules.
- Medullary thyroid carcinoma (MTC) is a neuroendocrine tumor of the thyroid.
Observation:
- A 48-year-old woman presented with a solitary thyroid nodule.
- Initial fine-needle aspiration cytology suggested follicular neoplasia.
- Intraoperative frozen section raised suspicion for medullary thyroid carcinoma.
Findings:
- Final pathology confirmed medullary thyroid carcinoma, follicular variant.
- Immunohistochemistry was positive for calcitonin and negative for thyroglobulin.
- This rare variant is often diagnosed based on immunohistochemical markers.
Implications:
- Distinguishing this variant from mixed medullary-follicular carcinomas is crucial.
- Immunohistochemical analysis for calcitonin and thyroglobulin is essential for accurate diagnosis.
- Further research on this rare thyroid cancer variant is warranted.