Table 1.

Renal cell carcinoma metastatic to thyroid neoplasm: characteristics of the cases reported in the literature

Case number	Authors	Receiving thyroid neoplasm	Interval	Immunohistochemistry
1	Bohn et al.[3]	Papillary carcinoma	2 Y	THY (−) RCC marker +
2	Rosai et al. cited by Bohn and Ryska[3,4]	Follicular adenoma	NA	THY (−)
3	Chacho et al. cited by Ryska[4]	Follicular adenoma	Synchronous	Not done
4	Baloch et al. cited by Bohn and Ryska[3,4]	Papillary carcinoma, follicular variant	2 Y	THY (−) CK19 (−)
5	Wolf et al.[5]	Microfollicular adenoma	NA	Not done
6	Ryska and Cap [4]	Oncocytic carcinoma	13 M	THY (−), vimentin (+), calcitonin (−), EMA (+), CK AE1-AE3 (+)
7	Qian et al.[6]	Hürthle adenoma	Synchronous	TTF-1 (−), THY (−), CD10 (+), vimentin (+)
8	Koo et al. cited by Bohn[3]	Follicular adenoma	5 Y	TTF-1 (−), THY (−), calcitonin (−). Equivocal CK and CD10
9	Yu et al.[7]	Papillary carcinoma	3 Y	THY (−), TTF-1 (−), CD10 (+), vimentin (+), RCC antigen (−)
10	Medas et al. (present case)	Microfollicular adenoma	6 Y	TTF-1 (−), THY (−), CD10 (+)

Abbreviations: CK, cytokeratin; EMA, epithelial membrane antigen; M, months; NA, not available; RCC, renal cell carcinoma; THY, thyroglobulin; TTF-1, thyroid transcription factor-1; Y, years.