<prompt> Which is the commonest true benign bone tumor?Osteoid osteomaHemangiomaOsteochondromaEnchondroma  <response>: Ans. is a i.e.. Osteoid osteoma Important factso Commonest bone malignancieso Commonest primary malignant tumoro Commonest primary malignant tumor of long bones---SecondariesMultiple myelomaOsteosarcomao Commonest benign tumor of bone-OsteochondromaOsteochondroma is not true neoplasm since its growth stops with cessation of growth at the epiphyseal plateo Commonest true benign tumor of bone-Osteoid osteomao Commonest benign tumor of hand-EnchondromaCommonest siteo Ivory osteoma-Frontal sinuso Osteoid osteoma-Tibiaa Admantinoma Ameloblastoma-Mandibleo Chordoma-Sacrum and cervical spineo Osteoclastoma-Lowrer end of femuro Ewings sarcoma-Femur diaphysis tibia diaphysiso Osteosarcoma-Distal femur 45, Proximal tibia 25o Simple bone cyst-Proximal humeruso Aneurysmal bone cyst-Bones around knee Femur, tibiao Osteochondroma-Bones around knee distal femur proximal tibiao Fibrous dysplasiao Enchondroma--Proximal femur TibiaPhalanges of hando Multiple myeloma-Vertebraeo Metastasis-Vertebrae 