Carcinoma thyroid with blood-borne metastasis is-

As already explained above Papillary spreads mainly by → lymphatics Follicular spreads mainly by → hematogenous Anaplastic spreads mainly by → direct (lymphatic and blood-borne spread is also seen) Medullary spreads mainly by → lymphatics Also Remember "The most common sites of blood-borne metastasis are lung, bones and brain. Lung involvement is more frequent in papillary carcinoma, while bone involvement is more common in follicular thyroid Ca." Endocrine surgery of head & neck by Phillip K. Pellitteri & Thomas V. McCaffrey