Blood born metastasis is unusual of -: (A) Osteosarcoma, (B) Medullary carcinoma breast, (C) Chorio carcinoma, (D) Renal cell carcinoma
Answer is B. Lymphatic or vascular invasion is never seen in medullary Carcinoma of breast.
Osteosarcoma, Choriocarcinoma and RCC metastatize to distant organs by vascular invasion.