Giant cell tumor

Four Radiographic Criteria

1. Closed epiphyses
2. Epiphyseal abutting articular surface
3. Eccentrically located
4. Sharp trasition zone that is not sclerotic

• These rules do not apply for flat bones (pelvis) or apophysis (greater trochanter).
• Cannot differentiate 15% of giant cell tumors which are malignant.
• No sclerotic margin.

Differential Diagnosis

Fog Machines or Fegnomashic

• Fibrous dysplasia
• Osteoblastoma
• Giant cell tumor
• Metastatic disease and Myeloma
• Aneurysmal bone cyst
• Chondroblastoma, Chondromyxoid fibroma
• Hyperparathyroidism
• Infection
• Nonossifying fibroma
• Enchondroma, Eosinophilic granuloma
• Solitary bone cyst