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Aneurysmal Bone Cyst of the Coracoid Process: A Case Report
André Castanheira1, Pedro Amaro1, Raquel Costa1
1Hospital Beatriz Ângelo, Loures, Portugal, hbeatrizangelo.pt.
Case Reports in Orthopedics
|May 29, 2026
Summary
Aneurysmal bone cysts (ABCs) are rare in the coracoid process. This case shows advanced imaging and bone graft substitutes are effective for treating these aggressive lesions.
Area of Science:
- Orthopedic Surgery
- Oncology
Background:
- Aneurysmal bone cysts (ABCs) are benign but locally aggressive bone lesions.
- Coracoid process involvement is rare and diagnostically challenging.
- Atypical shoulder pain can mask underlying bone pathology.
Purpose of the Study:
- To report a rare case of an aneurysmal bone cyst in the coracoid process.
- To evaluate the efficacy of biphasic bone graft substitutes in treating coracoid ABCs.
- To emphasize the role of advanced imaging in diagnosing shoulder pathologies.
Main Methods:
- Case report of a 37-year-old male with shoulder pain.
- Advanced imaging (CT/MRI) for diagnosis.
- Surgical management: intralesional curettage and biphasic calcium sulfate-hydroxyapatite bone graft substitute.
- Histopathological analysis for confirmation.
Main Results:
- An asymptomatic ABC of the coracoid process was incidentally discovered.
- Surgical treatment with bone graft substitute was successful.
- Patient remained asymptomatic with full shoulder function at 1-year follow-up.
- No recurrence of ABC or evidence of initial calcific tendinitis.
Conclusions:
- Advanced imaging is crucial for atypical shoulder pain.
- Biphasic bone graft substitutes are safe and effective for coracoid ABCs.
- Further research is needed for long-term outcomes and standardized protocols.
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