This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
Most common site of Ewing's sarcoma - 
Select and explain. 
A. Upper end of tibia, B. Shaft of tibia, C. Lower end of femur, D. Shaft of femur
D: Shaft of femur
Answer: D: Shaft of femur 
Explanation: Ans. is 'd' i.e., Shaft of femur Commonest siteo Ivory osteoma-Frontal sinuso Osteoid osteoma-Tibiao Admantinoma (Ameloblastoma)-Mandibleo Chordoma-Sacrum and cervical spineo Osteoclastoma-Lower end of femuro Ewing's sarcoma-Femur diaphysis > tibia diaphysiso Osteosarcoma-Distal femur (45%), Proximal tibia (25%)o Simple bone cyst-Proximal humeruso Aneurysmal bone cyst-Bones around knee (Femur, tibia)o Osteochondroma-Bones around knee (distal femur > proximal tibia)o Fibrous dysplasia-Proximal femur > Tibiao Enchondroma-Phalanges of hando Multiple myeloma-Vertebraeo Metastasis-Vertebrae