Malignant bone tumors are all except:
Osteosarcoma
Gaint cell tumor (Osteoclastoma)
Aneurysmal bone cyst
Chondrosarcoma
Ans: C (Aneurysmal bone cyst) "Aneurysmal hone cysts are locally destructive, blood-filled reactive lesions of bone and are not considered to be true neoplasms(Ap]ey; benign neoplasm-Maheshwari). Any bone may be involved, but the most common locations include the proximal humerus, distal femur, proximal tibia, and spine"-Apley 8th/180-81. Maheshwari 3rd/227"Giant cell tumors are benign, indeterminate & malignant"- Maheshwari 3rd /214Table (Robbins 7thfl292): Classification of Primary Tumors In- volving BonesHistologic TypeBenignMalignantHematopoietic (40%) MyelomaMalignant lymphomaChondrogenic (22%)OsteochondromaChondrosarcomaChondromaDedifferentiated cho- drosarcomaChondroblastomaMesenchymal chon- drosarcomaChondromyxoid fibroma Osteogenic (19%)Osteoid osteoma OsteoblastomaOsteosarcomaUnknown origin (10%)Giant cell tumorEwing tumorGiant cell tumor AdamantinomaHistiocytic originFibrous histiocytomaMalignant fibrous histiocytomaFibrogenicMetaphyseal fibrous defect (fibroma)Desmoplastic fibromaFibrosarcomaNotochordal ChordomaVascularHemangiomaHemangioendothelioma HemangiopericytomaLipogenic NeurogenicLipoma NeurilemmomaLiposarcoma
Classification of Bone Tumors