Table 2.

Incidence of primary tumors metastasising to the thyroid and treatment as reported in clinical series

Study	n	Most frequent site of primary tumor	Total thyroidectomy (%)
Mayo et al.42	19	Lung	Not available
Elliot et al.34	14	Breast = lung	43
Wychulis et al.43	14	Kidney	14
Harcourt-Webster35	11	Skin	0
Pillay et al.44	10	Esophagus	10
Brady et al.36	14	Lung	Not available
Ericsson et al.33	10	Kidney	70
Czech et al.32	12	Kidney	100
Ivy et al.37	30	Kidney	Not available
Chacho et al.45	8	Blood	0
Smith et al.46	19	Breast	0
Michelow et al.47	21	Lung	0
Rosen et al.21	11	Lung	55
Nakhjavani et al.28	43	Kidney	21
Lam et al.38	79	Lung	Not available
Chen et al.40	10	Kidney	50
De Ridder et al.26	6	Kidney	67
Dequanter et al.48	11	Lung	82
Wood et al.30	15	Kidney	47
Kim et al.29	22	Breast	9
Mirallié et al.49	29	Kidney	72
Cichoń et al.31	17	Kidney	94
Gerges et al.39	7	Lung	0
Choi et al.50	46	Lung	0
Russell et al.41	17	Kidney	65