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