Aneurysmal Bone Cyst of the Coracoid Process: A Case Report

Aneurysmal bone cysts (ABCs) are benign yet locally aggressive lesions that can cause significant bone destruction. Involvement of the coracoid process is exceedingly rare, and the diagnosis is particularly challenging due to its atypical presentation.

We report the case of a 37-year-old male with right shoulder pain initially attributed to calcific tendinitis. Advanced imaging incidentally revealed an asymptomatic ABC of the coracoid process. Surgical management involved intralesional curettage and cavity filling with a biphasic calcium sulfate-hydroxyapatite bone graft substitute. Histopathological analysis confirmed the diagnosis of a benign ABC. Postoperative recovery was uneventful, and at 1-year follow-up, the patient was asymptomatic with full shoulder function. Follow-up CT imaging showed no evidence of recurrence and resolution of the initial calcific tendinitis.

This case highlights the importance of advanced imaging in atypical shoulder pain and demonstrates that biphasic bone graft substitutes offer a safe and effective alternative to traditional bone grafting in the treatment of ABCs, even in rare anatomical locations. Further research is needed to validate long-term outcomes and establish standardized treatment protocols.