Aneurysmal bone cyst: With uncommon location and presentation – A case series with review of literature

Aneurysmal bone cyst (ABC) is a expansile osteolytic bone lesion of unknown aetiology. These lesions are usually present in the long bones, particularly the humerus, femur, tibia, and fibula and are composed of blood-filled cavities with the female predominance. ABC is differentiated into two variants such as primary and secondary. Primary ABC arises de novo, whereas secondary arises in association with some pathology. Here, we are presenting three unusual cases of ABC; two cases were reported here because of their rare locations such as talus and ulna, whereas the last case was of giant cell tumor with secondary ABC.