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44 Cards in this Set
- Front
- Back
- 3rd side (hint)
Periosteal Reaction
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Periosteal Reaction
- Smooth - Lamellar - Spiculated/Palisading - Sunburst - Amorphous |
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- Smooth
- Palisading |
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Amorphous/Sunburt Periosteal reaction
very aggressive |
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Sunburst/Spiculated Periosteal Reaction
very aggressive |
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Pattern of Bone Destruction
- - - - |
Pattern of Bone Destruction
- Geographic, cortices intact - Permeative - Moth Eaten - Cortical Destruction |
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Permeative Lysis
Aggressive |
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Permeative Lysis
Aggressive |
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moth eaten lysis
aggressive |
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geographic lysis
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sharp margins
benign or aggressive |
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- benign bone cyst
- osteosarcoma |
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Zone of Transition
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zone between normal and abnormal bone
short <2 mm intermediate 2-5mm long >5 mm |
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long zone of transition
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aggressive
permiative lysis |
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long zone of transition
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aggressive
permeative lysis spiculate/amorphus periosteal rxn |
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long zone of transition
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aggressive
spiculated/sunburst periosteal rxn |
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short zone of transition
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benign (usually)
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cortical disruption
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aggressive
permeative amorphous periosteal rxn soft tissues are thickened |
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cortical disruption
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aggressive
cortex destroyed at multiple spots |
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complete cortical disruption
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aggressive
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differentials for aggressive bone leasions
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neoplasia
osteomyeltitis |
biopsy required to distinguish
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types of primary bone neoplasia
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1) Osteosarcoma
2) Chondrosarcoma -fibrosarcoma -hemangiosarcoma -lymphoma |
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causes of osteomyelitis
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1) fungal infection
- coccidiomycosis - histoplasmosis - blastomycosis 2) bacterial infection - implant associated - penetrating injury - septicemia |
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Osteosarcoma
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• Most common primary bone neoplasm in dogs and cats
• Metaphyses, away from the elbow • Any bone |
• Can be primarily lytic, primarily proliferative, or mixed lytic and proliferative
• Pathologic fractures |
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Fungal Osteomyelitis
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• Permeated lysis, long zone, cortical destruction, soft tissue swelling
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Bacterial Osteomyelitis
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• Usually secondary to surgery/ surgical implant/trauma/wound
• Much less common than fungal in small animals • More common in foals and calves |
• Exuberant proliferative, chronic reactive
• Mineralization and new bone formation • Sequestrums can occur |
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Metastatic Sarcoma
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Polyostotic lesions
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Cortical destructions
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probability of cancer vs infection
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dogs with bone neoplasia not systemically ill.
those with fungal infection are |
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primary bone neoplasia
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solitary metaphyseal aggressive bone lesion in dogs or cats
- should be considered a primary bone neoplasm until proven otherwise |
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osteosarcoma
- primarily lytic - primarily proliferative |
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osteosarcoma
- mixed lytic and proliferative |
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osteosarcoma
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osteosarcoma with pathologic fracture
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permeative palisading to amorphus
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chondrosarcoma
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can't distinguish from osteosarcoma
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fungal osteomyelitis
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cocidioidomyscosis
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fungal osteomyelitis
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coccidiodomycosis
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fungal osteomyeltitis
coccidiomycosis |
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fungal osteomyelitis
blastomycosis |
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bacterial osteomyelitis
sequestrum |
sharply marginated bone fragment surrounded by lucent halo
surrounded by sclerotic bone (involucrum) may or may not be septic |
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polyostotic aggressive bone lesions
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metastatic neoplasia
- carcinomas, osteosarcoma mycotic (fungal) osteomyelitis |
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polyostotic lesions: metastatic sarcoma
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Hypertrophic Osteopathy (HO)
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• Secondary to a mass in the thoracic cavity (or abdominal or bladder mass)
• Bilateral, symmetrical • Starting point = abaxial digits • Resolves after mass removal |
• Periosteal proliferation of appendicular long bones
• Palisading/speculated • Begins distally, proceeds proximally • Soft tissue swelling of limb • Multiple bones affected |
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Hepatozoonosis
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• Systemic infection from protozoa
- systemic illness |
• Periosteal proliferation on bones
• Usually smooth lamellar, can be irregular |
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Hypertrophic osteopathy
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hypertrophic osteopathy
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Hepatozoonosis
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