Abstract

Introduction: An aneurysmal bone cyst is a rare,benign, destructive,hemorrhagic and,expansile lesion accounting for 1% of all bone tumorswith a thin wall containing blood-filled cystic cavities. The termAneurysmal is derived from the macroscopic appearance of a sponge-liketumor containing numerous giant cells. This type of lesionpredominantly affects the metaphysis of the long bone.

Case Report: we present a case of a 14-year-old female patient presented with an aneurysmal bone cyst of the right proximal ulna. It is an unusual presentation for its location,which presented with swelling and pain progressive over three months. The plain radiograph showed an expansile lytic lesion with a thin shell of cortical bone at the proximal ulna. Surgical exploration shows a pulsatile blood-filled cystic lesion.

Results: Postoperatively uneventful.The patient was prescribed physiotherapy and was advised for monthly follow-up. The patient had a full range of motion at the last follow up visit and was conveniently able to do his daily activities.

Conclusion: An aneurysmal bone cyst is a destructive, hemorrhagic, and tumor-like lesion occurring predominantly in teenaged patients. Radiographs and MRI scans can often confirm ABC's diagnosis; Excision of tumor and replacement of bone defects with anautograft are considered safe procedures with minimal recurrence risk.

The present study describes a sporadic case of an ABC in the proximal ulna. It highlighted the importance of radiological and MRI for the diagnosis of the aneurysmal bone cyst.