Findings: X-ray of the right wrist in a 13 year old female showing an expansile lytic lesion involving the metaphysis of the distal ulna. The margins are well-defined and there are multiple internal septations. There is no discrete evidence for periostitis.
Diagnosis: Aneurysmal bone cyst.
Discussion:
- Radiographic findings of aneurysmal bone cyst include an eccentric, lytic lesion, with an expanded, remodeled bony contour. Radiographs on occasion may show internal densities characteristic of chondroid matrix. In addition, internal septations are common.
- The appropriate treatment of an aneurysmal bone cyst include identifying its specific pre-existing lesion. Treatment is generally directed at surgical removal of the entire lesion versus curettage with bone grafting.
