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Thyroid metastasis from renal cell carcinoma presenting as a solid mass with rapid enlargement
Isabella Chiardi1,2, Priska Gaffuri3, Andrea Leoncini4
1Thyroid Unit of Clinic for Endocrinology and Diabetology, Lugano Regional Hospital, Ente Ospedaliero Cantonale, Bellinzona, Switzerland.
Endocrinology, Diabetes & Metabolism Case Reports
|February 6, 2024
Summary
Thyroid metastases from nonthyroidal malignancies are rare but challenging to diagnose, often mimicking primary thyroid cancers. Clinicians must consider NTMs, especially with diffuse thyroid hypoechogenicity and hypothyroidism.
Area of Science:
- Oncology
- Endocrinology
- Radiology
Background:
- Thyroid metastases from nonthyroidal malignancies (NTMs) are uncommon, representing about 2% of thyroid malignancies.
- These metastases present diagnostic challenges due to varied clinical features and can mimic primary thyroid cancers.
- Ultrasound features are often non-specific, limiting the utility of standard risk stratification systems.
Purpose of the Study:
- To highlight the diagnostic complexities of thyroid metastases from NTMs.
- To emphasize the importance of considering oncological conditions in thyroid mass assessment.
- To report a unique case of thyroid metastasis from renal cell carcinoma.
Main Methods:
- Case report detailing a unique instance of thyroid metastasis from renal cell carcinoma.
- Review of clinical presentation, diagnostic challenges, and management considerations.
- Discussion of diagnostic modalities including ultrasound and fine needle aspiration cytology.
Main Results:
- The case illustrates the difficulty in distinguishing NTM thyroid metastases from primary thyroid malignancies.
- Fine needle aspiration cytology may not always yield definitive results.
- Diffuse thyroid hypoechogenicity and hypothyroidism were noted, mimicking autoimmune thyroid disease.
Conclusions:
- Awareness of thyroid metastasis from NTMs is crucial for accurate diagnosis.
- Endocrinologists should consider NTMs in patients with thyroid hypofunction, especially with a history of other cancers.
- Comprehensive oncological assessment is vital when evaluating thyroid masses.
