Aneurysmal bone cyst .
- Aneurysmal bone cyst is a pseudocyst of vascular origin. It consists of an osseous cavity lined by fibrous connective tissue and containing cavernous spaces filled with blood.
- It is usually found in children and adolescents.
- Most common location: molar region and anterior area of the mandible.
- Early, small lesion may be unilocular but as it grows it becomes multilocular (soap bubble or honeycomb appearance).
- Often well defined and well corticated borders.
- It may cause extensive cortical expansion and swelling. The adjacent teeth are displaced but root resorption is rare.
