| Aneurysmal Bone Cyst (ABC) | |
| Primary ABC | |
| Secondary ABC | |
| Giant cell tumors | |
| Chondroblastoma | |
| Osteoblastoma | |
| Simple Bone Cyst (after fracture) | |
| Telangiectactic Osteosarcoma | |
| Uncommon Causes | |
| Metastases (esp. Renal Cell and Lung primaries) | |
| Synovial sarcoma | |
| Synovial hemangioma | |
| Myositis ossificans | |
| Adamantinoma | |
| Neurogenic tumors | |