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***Physiological loss of skeletal mass with age
 
***Physiological loss of skeletal mass with age
 
***May be excessive in some individuals
 
***May be excessive in some individuals
***Histologically - dead [[Bones - normal#Normal stucture|osteocytes and empty lacunea]]
+
***Histologically - dead [[Bones - Anatomy & Physiology|osteocytes and empty lacunea]]
 
**Physical inactivity (disuse) - muscular inactivity and reduced weight bearing, e.g. during limb casting
 
**Physical inactivity (disuse) - muscular inactivity and reduced weight bearing, e.g. during limb casting
 
**Glucocorticoids
 
**Glucocorticoids
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***Scattered cancellous and endosteal bone
 
***Scattered cancellous and endosteal bone
 
*Histologically:
 
*Histologically:
**Empty [[Bones - normal#Normal structure|lacunae or contain dead osteocytes]]
+
**Empty [[Bones - Anatomy & Physiology|lacunae or contain dead osteocytes]]
 
**Matrix remains mineralised
 
**Matrix remains mineralised
 
*Necrotic bone is slowly resorbed, sequstered or covered by new woven bone  
 
*Necrotic bone is slowly resorbed, sequstered or covered by new woven bone  
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*'''Simple cysts'''
 
*'''Simple cysts'''
 
**May contain clear colourless fluid, or serosanguinous
 
**May contain clear colourless fluid, or serosanguinous
**Wall of dense fibrous tissue, [[Bones - normal#Bone organisation|woven or lamellar bone]]
+
**Wall of dense fibrous tissue, [[Bones - Anatomy & Physiology|woven or lamellar bone]]
 
*'''Aneurysmal bone cysts'''
 
*'''Aneurysmal bone cysts'''
 
**Expansie lesions
 
**Expansie lesions
Author, Donkey, Bureaucrats, Administrators
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