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Line 8: |
| | ===[[Osteoporosis]] (Atrophy)=== | | ===[[Osteoporosis]] (Atrophy)=== |
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| − | ===Osteosis=== | + | ===[[Osteosis]]=== |
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| − | *Also called '''Aseptic necrosis''' or '''Ischaemic necrosis'''
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| − | *Degeneration and necrosis of osseous tissue
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| − | *Due to bone marrow pressure and ischaemia resulting from
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| − | **[[Bones Fractures - Pathology|Fractures]]
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| − | **Excessive heat e.g. horn disbudding
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| − | **Neoplasia ([[Bones Hyperplastic and Neoplastic - Pathology#Osteosarcoma|osteosarcoma]] and [[Bones Hyperplastic and Neoplastic - Pathology#Lymphosarcoma|lymphosarcoma]])
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| − | *Grossly:
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| − | **Necrotic bone difficult to recognise
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| − | **Sometimes, periosteum becomes dry, dull and detaches easily
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| − | **On longitudinal section
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| − | ***Yellow-white necrotic bone
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| − | ***Scattered cancellous and endosteal bone
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| − | *Histologically:
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| − | **Empty [[Bones - Anatomy & Physiology|lacunae or contain dead osteocytes]]
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| − | **Matrix remains mineralised
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| − | *Necrotic bone is slowly resorbed, sequstered or covered by new woven bone
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| − | *Persists
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| − | *May not be detected radiographically
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| − | *Associated with [[Joints Degenerative - Pathology#Calve Legg-Perthe's disease|Calve-Legg Perthe's disease]]
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| | | | |
| − | [[Category:Bones - Degenerative Pathology]]
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| | ===Bone cysts=== | | ===Bone cysts=== |
| | [[Image:Bone cysts dog.jpg|right|thumb|100px|<small><center>Bone cysts (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]] | | [[Image:Bone cysts dog.jpg|right|thumb|100px|<small><center>Bone cysts (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]] |