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Bone Lesion by Location-CENTRAL
- Enchondroma
- Central Chondrosarcoma
- Ewing Sarcoma
- Primary Lymphoma
- MFH
- Simple Bone Cyst
- EG
- Fibrous Dysplasia
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Bone Lesion by Location-ECCENTRIC
- Osteosarcoma
- Chondromyxoid Fibroma
- ABC
- Giant Cell Tumor
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Bone Lesion by Location-CORTICAL
- Osteoid Osteoma
- Ossifying Fibroma
- Osteochondroma
- Adamantinoma
- NOF/ FCD
- Fibrous Dysplasia (Occasionally)
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Bone Lesion by Location-SURFACE
- Parosteal Osteosarcoma
- Periosteal Osteosarcoma
- Juxtacortical Chondroma
- Giant Cell Tumor of the Tendon Sheath
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Bubbly Bone Lesion
- FEGNOMASHIC
- Fibrous Dysplasia (No Periosteal Reaction)
- EG (< 30yrs)
- Enchondroma (Calcification Except in Fingers, Painless)
- Giant Cell Tumor (Epiphysis Closed, Abuts Articular Surface, Well Defined, NO Sclerotic Margin, Eccentric, DDX: Desmoplastic Fibroma)
- NOF > 2cm/ FCD < 2cm (< 30yrs, Cortically Based, Painless)
- Osteoblastoma
- Myeloma/ Mets (> 40yrs)
- ABC (< 30yrs, Expansile, Eccentric)
- Simple Bone Cyst (< 30yrs, Central)
- Hyperparathyroidism (Brown Tumor, Look for Other Evidence of HPT)
- Hemophiliac Pseudotumor
- Infection (Bony Sequestrum), Intraosseous Lipoma
- Chondroblastoma (< 30 yrs, Epiphyseal)
- Chondromyxoid Fibroma (Eccentric, Proximal Tibia or Distal Femur, No Calcified Matrix)
- Lytic Pagets
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Lesions < 30
EG, NOF/FCD, ABC, SBC, Chondroblastoma
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Posterior Vertebral Body Scalloping
- Dural Ectasia (NF1, Marfans, Ehlars-Danlos)
- Increased Pressure (Neoplasm, Syrinx, Comm. Hydrocephalus)
- Bone Resorption (Acromegaly)
- Congenital (Achondroplasia, OI, Mucopolysaccharidoses such as Hunters, Hurlers and Morquios)
- Physiologic
- Ankylosing Spondylitis (Arachnoid Diverticula)
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Prominent Osteophytes/Enthesophytes
- DISH
- Ossification of the ALL and/or PLL
- Acromegaly
- Retinoid Toxicity (Used in Treatment of Ichthyosis)
- DJD
- Fluorosis
- Seronegative Spondoloarthropathy (Psoriatic, Reiter�s)
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Atlanto-Axial Subluxation (> 2.5 mm in Adult)
- RA/ JRA
- Downs Syndrome
- Trauma
- Seronegative Spondoloarthropathies
- SLE
- Morquio Syndrome
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Fusion of the Cervical Spine
- JRA (Posterior Elements)
- Klippel-Feil (Vertebral Body Fusion, Associated with Sprengel�s Deformity in 25%- Omovertebral Bone)
- Ankylosing Spondylitis
- Myositis Ossificans Progressiva (Ligamentum Nuche Calcification)
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Basilar Invagination- Primary
- Odontoid Process Tip >5mm Above Chamberlain�s Line (Hard Palate to the Foramen Magnum)
- Primary Developmental (Associated with Chiari, Syrinx)
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Basilar Invagination - Acquired:
- PF ROACH
- Paget�s
- Fibrous Dysplasia
- Ricket�s
- Osteogenesis Imperfecta/ Osteomalacia
- Achondroplasia
- Cleidocranial Dysostosis
- Hyperparathyroidism/ Hurler (Mucopolysaccharidosis)
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Odontoid Erosion
- RA
- Amyloid
- Atypical Infection
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Vertebral Body/ Pedicle Tumor - BENIGN
- Hemangioma
- EG
- Giant Cell Tumor
- Osteoid Osteoma
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Vertebral Body/ Pedicle Tumor � MALIGNANT
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Periosteal Reaction in Multiple Bones (adult)
- Hypertrophic Pulmonary Osteoarthropathy (Painful)
- Pachydermoperiostitis (Primary HPO)
- Thyroid Acropachy (Painless)
- Vascular Insufficiency
- Flurosis
- Hypervitaminosis A
- Fractures
- Infection (Usually Focal)
- Tumor (Usually Focal)
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Focal Cortical Thickening
- Stress Fracture
- Osteoid Osteoma
- Osteomyelitis
- Tumor (Osteosarcoma, Ewing�s, Lymphoma)
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DDx For Osteoid Osteoma
- Chronic Infection with Brodie�s Abscess
- Stress Fracture
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