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*Histologically:
*Histologically:
**Covered with thin layer of bone
**Covered with thin layer of bone
**Consist of [[Bones - normal#Bone organisation|cancellous bone]]
**Consist of [[Bones - Anatomy & Physiology|cancellous bone]]
**Differentiated [[Bones - normal#Normal structure|osteoblasts and osteoclasts]]
**Differentiated [[Bones - Anatomy & Physiology|osteoblasts and osteoclasts]]
*Cause disfigurement, may obstruct nasal passages
*Cause disfigurement, may obstruct nasal passages
*Recur if not completely removed
*Recur if not completely removed
===In Horses===
===In Horses===
*Haemartoma arising from periosteum of the skull or facial bones
*Haemartoma arising from periosteum of the skull or facial bones
*See [[Bones Hyperplastic and Neoplastic - Pathology#Osteoma|Bones and Cartilage - hyperplastic and neoplastic]]
*See [[Osteoma|Bones and Cartilage - hyperplastic and neoplastic]]
*Benign
*Benign
*Clinical signs:
*Clinical signs:
[[Category:Paranasal Sinuses - Pathology]]
[[Category:Paranasal Sinuses - Pathology]][[Category:Bones - Neoplastic Pathology]]
[[Category:Neoplasia]]
[[Category:Neoplasia]]