Bone Tumors-Behavior Spectrum
Core Insight
- Bone tumors have a relatively clear distinction between benign and malignant based on radiology, age, and location.
- Imaging + clinical features usually > 80% diagnostic confidence before biopsy.
Key Points
- Histology ≈ Imaging ≈ Behavior
- Use: Age, location, matrix, periosteal reaction, growth pattern
- Modified Lodwick classification : For aggressiveness of lytic lesions.
Behavior Spectrum
| Behavior | Example Tumors | Notes |
|---|---|---|
| Benign | Non-ossifying fibroma, Enchondroma | Incidental, non-destructive |
| Aggressive benign | Giant cell tumor (GCT), aneurysmal bone cyst (ABC) | Locally destructive, rare metastasis (GCT) |
| Low-grade malignant | Adamantinoma, Parosteal Osteosarcoma | Slow-growing but can recur/metastasize |
| High-grade malignant | Osteosarcoma, Ewing sarcoma, Chondrosarcoma | Rapid growth, soft tissue mass, mets |
Pearl: Radiologic aggressiveness ≠ always malignancy (e.g., GCT, ABC).
