Swelling over distal end of femur with secondaries in lungs, diagnosis is:: (A) Osteogenic sarcoma, (B) Giant cell tumor, (C) Osteoclastoma, (D) Ewing's sarcoma
Answer is A. Ans. is 'a' ie Osteogenic sarcoma Osteosarcoma are aggressive lesion and metastasize widely through the blood stream; usually first to the lungs.Ewing's sarcoma also metastasizes, to lung & bones. Bone to bone metastasis are more commonOsteoclastoma rarely metastasizes.Thus this lesion could be either osteosarcoma or Ewing's sarcoma but osteosarcoma would produce swelling at distal end of femur (b/c it arises from metaphysis) and Ewing would not be placed distally b/c it arises from the diaphysis.