IS Case 595: Aneurysmal bone cyst (ABC) within the talus
Imaging Sciences URMC 2010
Publication Date: 2011-11-17
An aneurysmal bone cyst (ABC) is an expansile lesion with thin-walled blood filled cysts. Usually, patients present in the first through third decades of life with pain and swelling for weeks to years. ABCs are mostly found in long tubular bone metaphyses or in the spine. On radiographs, osteolysis and expansion are predominant features. In tubular bones, there is cortical thinning, expansion, thin trabeculation, periosteal reaction, and pathologic fracture. In the spine, the lesion involves the posterior elements or the posterior elements and the vertebral body. In other site, soft tissue extension may make it hard to differentiate ABC from sarcoma. CT and MRI can demonstrate fluid levels within the lesion. These lesions do have potential for growth, bone destruction and soft tissue invasion so they are treated surgically or with radiotherapy.
- Resnick D. Bone and Joint Imaging. Philadelphia: Saunders, 1989:1169-1170.