Neoplastic
1. Metastases, especially breast
2. Chondroid Lesions
a. Benign
– Enchondroma
– Chondroblastoma
– Chondromyxoid Fibroma
b. Malignant
– Chondrosarcoma
3. Osteoid lesions
a. Benign
– Osteoid Osteoma
– Osteoblastoma
b. Malignant
– Osteosarcoma
4. Fibrous Tissue lesions
a. Malignant
– Fibrosarcoma
– Malignant Fibrous Histiocytoma

Miscellaneous
– Fibrous Dysplasia
– Osteoporosis circumscripta (Pagets, Hyperparathyroidism)
– Avascular necrosis/Infarction of the Bone
– Osteomyelitis with sequestrum
– Eosinophilic Granuloma
– Intra-osseous Lipoma