Changes

*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