Changes

*Idiopathic hyperostosis in calvaria of young male Bullmastiffs

*Idiopathic hyperostosis in calvaria of young male Bullmastiffs

*5-10mths old, male

*5-10mths old, male

*Similar to [[Bones Hyperplastic and Neoplastic - Pathology#Craniomandibular osteopathy|craniomandibular osteopathy (CMO)]]

*Similar to [[Craniomandibular Osteopathy|craniomandibular osteopathy (CMO)]]

*Progressive and often assymetrical skull bone formation

*Progressive and often assymetrical skull bone formation

*Grossly:

*Grossly:

**Trabeceulae of the calvarial diploe are thickened and contiguous with a sunburst-like pattern of subperiosteal trabeculae composed of [[Bones - Anatomy & Physiology|woven and lamellar bone]]  

**Trabeceulae of the calvarial diploe are thickened and contiguous with a sunburst-like pattern of subperiosteal trabeculae composed of [[Bones - Anatomy & Physiology|woven and lamellar bone]]  

**Considerable remodeling (contrast with [[Bones Hyperplastic and Neoplastic - Pathology#Craniomandibular osteopathy|CMO]] – where there is rarely much remodeling of the woven bone to lamellar cortical bone)

**Considerable remodeling (contrast with [[Craniomandibular Osteopathy|CMO]] – where there is rarely much remodeling of the woven bone to lamellar cortical bone)

*Histologically:

*Histologically:

**Mild inflammation (mainly [[Neutrophils|neutrophils]])  

**Mild inflammation (mainly [[Neutrophils|neutrophils]])