Malignant bone tumors are all except:
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
Osteosarcoma
Gaint cell tumor (Osteoclastoma)
Aneurysmal bone cyst
Chondrosarcoma
Classification of Bone Tumors