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Breast metastasis of papillary thyroid carcinoma
  1. Rinrada Worapongpaiboon and
  2. Mawin Vongsaisuwon
  1. Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
  1. Correspondence to Dr Mawin Vongsaisuwon; mawin.v{at}


Papillary thyroid carcinoma (PTC) is the most common type of thyroid cancer, and regional neck metastasis is more common than distant metastasis. If present, metastasis most frequently occurs in lungs and bones. Follicular variant of papillary thyroid carcinoma (FVPTC) is a mixture of the classic and follicular thyroid carcinoma and metastasizes in the same fashion as the PTC with cervical lymph nodes as the most common site. A case of atypical presentation of FVPTC with rib metastasis is reported. We present a case of an old man with a left-sided palpable breast mass for 2 months in duration without breast pain. Initially, the breast mass was categorised as Breast Imaging Reporting and Data System (BI-RADS) 4a via ultrasonography. Subsequent immunohistochemistry demonstrated that the mass was metastatic thyroid cancer. Consequently, a CT scan revealed a tumour originating from the rib. The patient was finally diagnosed with metastatic FVPTC.

  • Thyroid disease
  • Breast cancer
  • Endocrine cancer
  • Radiotherapy

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  • Contributors RW was the major contributor and was responsible for drafting the manuscript and revised the content. MV was the surgeon responsible for treating the patient and substantively revised the manuscript for important content. Both authors read and gave approval of the final manuscript to be published.

  • Funding This study was funded by Faculty of Medicine, Chulalongkorn University.

  • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.