<prompt> Secondary aneurysmal bone cyst arises in -OsteoclastomaChondroblastomaFibrous dysplasiaAll of the above  <response>: Most of the time 80 aneurysmal bone cyst is primary, and no other pathology is found.Secondary aneurysmal bone cysts 20 occurs when bone changes of aneurysmal bone cyst occur in a pre-existing lesion:-Giant cell tumors osteoclastoma : - Most common Osteoblastoma Simple bone cystNon-ossifying fibroma Telangiectatic osteosarcomaMetastasisFibrous dysplasiaPagets disease Chondromyxoid fibromaChondroblastoma 