Etiology

2 theories:

1. Development of a dilated vascular bed in a pre-existing lesion
2. De novo bleeding within bone

Epidemiology

• Patient under 20 years
• More in mandible
• Female predilection

Clinical

• Facial swelling
• Progresses rapidly
• Pain/painless swelling of mandible

Histology

• Large blood filled spaces + fibrous tissue wall + no lining
• Surrounded by fibroblastic CT
• Multinucleated giant cells

Radiology

• Unilocular/multilocular radiolucency
• Cortical expansion – balloon/blown out distention of bone

Management

• Curettage
• Bleeding complications common intraoperatively

Picture