Secondary aneurysmal bone cyst arises in -: (A) Osteoclastoma, (B) Chondroblastoma, (C) Fibrous dysplasia, (D) All of the above
Answer is D. 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 cyst
Non-ossifying fibroma  
Telangiectatic osteosarcoma
Metastasis
Fibrous dysplasia
Paget's disease
 Chondromyxoid fibroma
Chondroblastoma