Breast metastasis of papillary thyroid carcinoma.
BMJ case reports(2022)
摘要
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.
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