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==Bones==
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*Benign neoplasm of bone
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*Uncommon
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*In horses and cattle
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*Sites
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**Flat bones (skull, scapula)
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**Mainly affect jaws and sinuses
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*Grossly:
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**Smooth bordered, slow-growing tumours
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*Histologically:
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**Covered with thin layer of bone
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**Consist of [[Bones - normal#Bone organisation|cancellous bone]]
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**Differentiated [[Bones - normal#Normal structure|osteoblasts and osteoclasts]]
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*Cause disfigurement, may obstruct nasal passages
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*Recur if not completely removed
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==Paranasal Sinuses==
 
==Paranasal Sinuses==
 
===In Horses===
 
===In Horses===
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