Aneurysmal Bone Cyst-An Unusual Presentation of Wrist Pain.

Aneurysmal bone cyst (ABC) is a cystic benign expansile lytic bone lesion, resembling multiple intraosseous blood-filled spaces. It is most commonly seen in the first two decades of life. Most frequent sites of involvement are metaphysis of proximal and distal femur, proximal tibia, and posterior elements of spine. It is seen more frequently in females. ABC of distal ulna is rarely reported in the literature.  We are reporting a case of ABC of a rare location-distal ulna-in a young male, which was successfully treated with extended curettage, and the cavity was filled with bone graft, with K-wire stabilization.